# Notion Writer CLI Enhancements Implementation Plan

> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.

**Goal:** Add local file/image uploads (via the `ntn` CLI) and an opt-in native-markdown write engine to the `notion-writer` skill, without regressing the existing block-converter path.

**Architecture:** Keep the token-based `notion-client` core. Add two focused, pure-where-possible modules — `ntn_files.py` (subprocess upload) and `md_translate.py` (dialect→Notion-markdown). The block parser stays pure; uploads happen in an isolated post-parse walk. A `--engine` flag selects between the existing block converter (default) and the new markdown endpoints.

**Tech Stack:** Python 3.12, `notion-client>=2.0.0`, `python-dotenv`, stdlib `subprocess`/`shutil`/`unittest.mock`, the `ntn` CLI (v0.18.0, already installed + logged in), Notion API `2025-09-03` (blocks) / `2026-03-11` (markdown).

## Global Constraints

- All work happens on branch `notion-writer-cli-enhancements` in repo `~/Project/our-claude-skills`.
- Skill code dir (all relative paths below are under it): `custom-skills/32-notion-writer/code/scripts/`.
- Tests use the existing custom harness (plain `assert` functions + a `run_all()` at bottom), run with `venv/bin/python test_<name>.py`. **No pytest.**
- The existing `test_parser.py` has **32 tests** and must stay green after every task. (The spec's "28" is a stale count; the real number is 32.)
- Default engine is `blocks` — existing CLI calls must behave identically. Markdown is opt-in via `--engine markdown`.
- Markdown *write* calls use a client built with `notion_version="2026-03-11"`. Schema/property/upsert-lookup calls stay on the default-version client.
- Parser purity is preserved: `markdown_to_notion_blocks` / `_parse_lines` make no I/O calls. Uploads live only in `ntn_files.py` and the `materialize_local_media` walk.
- `client.request(path=..., method=..., body=...)` paths omit the `v1/` prefix (the SDK adds it): use `"pages"` and `f"pages/{page_id}/markdown"`.
- Commit after every task. Use `git add <explicit files>` (never `git add -A`). End commit messages with the trailer:
  `Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>`

---

## File Structure

| File | Status | Responsibility |
|---|---|---|
| `ntn_files.py` | create | `preflight()`, `upload(path)`, `materialize_local_media(blocks, base_dir, upload_fn)`, `NtnUploadError` |
| `md_translate.py` | create | `translate(content)` + per-construct translators (callout/columns/toggle/mention) |
| `notion_writer.py` | modify | `IMAGE_RE`, `create_image_block`, `extract_local_images`, `_content_has_local_images`, CLI flags, engine routing, two-phase image append |
| `_notion_compat.py` | modify | `make_client(api_key, notion_version=None)`, `create_page_markdown`, `append_markdown`, `replace_markdown`, markdown cases in `explain_api_error` |
| `test_ntn_files.py` | create | unit tests for `ntn_files` (subprocess + walk mocked) |
| `test_md_translate.py` | create | unit tests for the translator |
| `test_engine_routing.py` | create | unit tests for compat markdown helpers + CLI routing (client mocked) |
| `test_parser.py` | modify | image-block tests |
| `requirements.txt` | modify | (no dep change expected; touched only if needed) |
| repo `.gitignore` | modify | ignore the skill's `venv/` |
| `code/CLAUDE.md`, `SKILL.md` | modify | document engines, uploads, flags; v1.3.0 |

---

### Task 1: Environment baseline (venv + green existing tests)

**Files:**
- Create: `custom-skills/32-notion-writer/code/scripts/venv/` (not committed)
- Modify: repo `.gitignore`

**Interfaces:**
- Consumes: nothing.
- Produces: a working `venv/bin/python` with deps installed; baseline of 32 green tests.

- [ ] **Step 1: Create the venv**

Run:
```bash
cd ~/Project/our-claude-skills/custom-skills/32-notion-writer/code/scripts
python3 -m venv venv
```

- [ ] **Step 2: Install dependencies**

Run:
```bash
venv/bin/python -m pip install -r requirements.txt
```
Expected: installs `python-dotenv` and `notion-client` (and transitive deps) with no error.

- [ ] **Step 3: Run the existing test suite (baseline)**

Run:
```bash
venv/bin/python test_parser.py
```
Expected: ends with `✅ All 32 tests passed`.

- [ ] **Step 4: Ignore the venv in git**

Append to the repo-root `.gitignore` (`~/Project/our-claude-skills/.gitignore`); create the file if missing. Add this line:
```
custom-skills/32-notion-writer/code/scripts/venv/
```

Verify it is ignored:
```bash
cd ~/Project/our-claude-skills && git status --short custom-skills/32-notion-writer/code/scripts/
```
Expected: no `venv/` entries appear.

- [ ] **Step 5: Commit**

```bash
cd ~/Project/our-claude-skills
git add .gitignore
git commit -m "$(printf 'chore(notion-writer): ignore scripts venv\n\nCo-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>')"
```

---

### Task 2: `ntn_files.py` — preflight + upload

**Files:**
- Create: `custom-skills/32-notion-writer/code/scripts/ntn_files.py`
- Test: `custom-skills/32-notion-writer/code/scripts/test_ntn_files.py`

**Interfaces:**
- Consumes: nothing (stdlib only).
- Produces:
  - `class NtnUploadError(Exception)` — attributes `.path` (str), `.stderr` (str).
  - `preflight() -> dict` — returns `{"workspace_name": str, "workspace_id": str}`; raises `NtnUploadError` if `ntn` is missing or not logged in. Cached after first success.
  - `upload(path) -> str` — uploads a local file via `ntn files create --plain`, returns the `file_upload_id`. Raises `NtnUploadError` on failure.

- [ ] **Step 1: Write the failing tests**

Create `test_ntn_files.py`:
```python
#!/usr/bin/env python3
"""Tests for ntn_files.py — run with `python test_ntn_files.py`."""

import sys
import subprocess
from pathlib import Path
from unittest import mock

sys.path.insert(0, str(Path(__file__).parent))

import ntn_files
from ntn_files import NtnUploadError


def _reset_cache():
    ntn_files._WORKSPACE = None


def test_preflight_missing_ntn():
    _reset_cache()
    with mock.patch("shutil.which", return_value=None):
        try:
            ntn_files.preflight()
            assert False, "expected NtnUploadError"
        except NtnUploadError as e:
            assert "ntn" in str(e).lower()


def test_preflight_returns_workspace():
    _reset_cache()
    fake = subprocess.CompletedProcess(
        args=[], returncode=0,
        stdout='{"bot":{"workspace_name":"D.Intelligence",'
               '"workspace_id":"ws-123"}}',
        stderr="",
    )
    with mock.patch("shutil.which", return_value="/usr/bin/ntn"), \
         mock.patch("subprocess.run", return_value=fake):
        info = ntn_files.preflight()
        assert info["workspace_name"] == "D.Intelligence"
        assert info["workspace_id"] == "ws-123"


def test_upload_returns_id():
    _reset_cache()
    fake = subprocess.CompletedProcess(
        args=[], returncode=0,
        stdout="43833259-72ae-404e-8441-b6577f3159b4\tphoto.png\tuploaded\n",
        stderr="",
    )
    with mock.patch("subprocess.run", return_value=fake):
        upload_id = ntn_files.upload(Path("/tmp/photo.png"))
        assert upload_id == "43833259-72ae-404e-8441-b6577f3159b4"


def test_upload_failure_raises():
    _reset_cache()
    fake = subprocess.CompletedProcess(
        args=[], returncode=1, stdout="", stderr="boom: invalid file",
    )
    with mock.patch("subprocess.run", return_value=fake):
        try:
            ntn_files.upload(Path("/tmp/bad.png"))
            assert False, "expected NtnUploadError"
        except NtnUploadError as e:
            assert e.path == "/tmp/bad.png"
            assert "boom" in e.stderr


def run_all():
    tests = [
        test_preflight_missing_ntn,
        test_preflight_returns_workspace,
        test_upload_returns_id,
        test_upload_failure_raises,
    ]
    for t in tests:
        print(f"\n{t.__name__}")
        t()
    print("\n" + "=" * 50)
    print(f"✅ All {len(tests)} tests passed")
    print("=" * 50)


if __name__ == "__main__":
    run_all()
```

- [ ] **Step 2: Run tests to verify they fail**

Run: `venv/bin/python test_ntn_files.py`
Expected: FAIL with `ModuleNotFoundError: No module named 'ntn_files'`.

- [ ] **Step 3: Write `ntn_files.py`**

Create `ntn_files.py`:
```python
#!/usr/bin/env python3
"""Local file uploads to Notion via the `ntn` CLI.

Owns all subprocess I/O for the skill. The CLI handles the full File Upload
lifecycle (create -> send bytes -> complete) and prints the upload ID.
"""

from __future__ import annotations

import json
import shutil
import subprocess
import sys
from pathlib import Path
from typing import Dict, List, Optional, Callable, Any

_WORKSPACE: Optional[Dict[str, str]] = None


class NtnUploadError(Exception):
    """Raised when `ntn` is unavailable or a file upload fails."""

    def __init__(self, message: str, path: str = "", stderr: str = ""):
        super().__init__(message)
        self.path = path
        self.stderr = stderr


def preflight() -> Dict[str, str]:
    """Verify `ntn` is installed and logged in; return its target workspace.

    Cached for the process. Raises NtnUploadError with an actionable hint
    on failure. Prints one informational line naming the workspace `ntn`
    targets (file uploads are workspace-scoped).
    """
    global _WORKSPACE
    if _WORKSPACE is not None:
        return _WORKSPACE

    if shutil.which("ntn") is None:
        raise NtnUploadError(
            "ntn CLI not found. Install it with: "
            "curl -fsSL https://ntn.dev | bash"
        )

    result = subprocess.run(
        ["ntn", "api", "v1/users/me"],
        capture_output=True, text=True,
    )
    if result.returncode != 0:
        raise NtnUploadError(
            "ntn is not logged in. Run: ntn login\n" + result.stderr.strip()
        )

    try:
        me = json.loads(result.stdout)
        bot = me.get("bot", {})
        info = {
            "workspace_name": bot.get("workspace_name", "unknown"),
            "workspace_id": bot.get("workspace_id", "unknown"),
        }
    except (ValueError, AttributeError):
        info = {"workspace_name": "unknown", "workspace_id": "unknown"}

    print(f'ntn -> workspace "{info["workspace_name"]}"', file=sys.stderr)
    _WORKSPACE = info
    return info


def upload(path: Path) -> str:
    """Upload a local file via `ntn files create --plain`; return its id."""
    path = Path(path)
    with open(path, "rb") as fh:
        result = subprocess.run(
            ["ntn", "files", "create", "--plain"],
            stdin=fh, capture_output=True, text=True,
        )
    if result.returncode != 0:
        raise NtnUploadError(
            f"ntn upload failed for {path}", path=str(path),
            stderr=result.stderr.strip(),
        )
    first_line = result.stdout.strip().splitlines()[0]
    upload_id = first_line.split("\t")[0].strip()
    return upload_id
```

- [ ] **Step 4: Run tests to verify they pass**

Run: `venv/bin/python test_ntn_files.py`
Expected: `✅ All 4 tests passed`.

- [ ] **Step 5: Commit**

```bash
cd ~/Project/our-claude-skills
git add custom-skills/32-notion-writer/code/scripts/ntn_files.py \
        custom-skills/32-notion-writer/code/scripts/test_ntn_files.py
git commit -m "$(printf 'feat(notion-writer): ntn_files upload + preflight\n\nCo-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>')"
```

---

### Task 3: Image blocks in the parser (pure)

**Files:**
- Modify: `custom-skills/32-notion-writer/code/scripts/notion_writer.py`
- Test: `custom-skills/32-notion-writer/code/scripts/test_parser.py`

**Interfaces:**
- Consumes: `parse_rich_text` (existing).
- Produces:
  - `IMAGE_RE` — compiled regex matching a standalone image line.
  - `create_image_block(alt: str, target: str) -> dict` — always external shape, `caption` = `parse_rich_text(alt)`.
  - `_parse_lines` emits an image block for standalone `![alt](target)` lines.

- [ ] **Step 1: Write the failing tests**

Add these test functions to `test_parser.py` (above `run_all`), and add their names to the `tests` list inside `run_all`:
```python
def test_image_remote_external():
    blocks = markdown_to_notion_blocks("![a chart](https://ex.com/c.png)")
    assert len(blocks) == 1
    b = blocks[0]
    assert b["type"] == "image"
    assert b["image"]["type"] == "external"
    assert b["image"]["external"]["url"] == "https://ex.com/c.png"
    assert b["image"]["caption"][0]["text"]["content"] == "a chart"


def test_image_local_external_shape_preupload():
    blocks = markdown_to_notion_blocks("![local](./pics/x.png)")
    assert len(blocks) == 1
    assert blocks[0]["image"]["external"]["url"] == "./pics/x.png"


def test_image_only_when_standalone():
    # An inline bang-bracket inside prose is NOT an image block.
    blocks = markdown_to_notion_blocks("see ![x](y.png) inline")
    assert blocks[0]["type"] == "paragraph"
```

Add to the `tests` list in `run_all`:
```python
        test_image_remote_external,
        test_image_local_external_shape_preupload,
        test_image_only_when_standalone,
```

- [ ] **Step 2: Run tests to verify they fail**

Run: `venv/bin/python test_parser.py`
Expected: FAIL — `test_image_remote_external` errors because the first block is a `paragraph` (or the `!` leaks), not an `image`.

- [ ] **Step 3: Add `IMAGE_RE` and `create_image_block`**

In `notion_writer.py`, add the constant next to `TABLE_SEPARATOR_RE` (near line 58):
```python
IMAGE_RE = re.compile(r'^\s*!\[([^\]]*)\]\(([^)\s]+)\)\s*$')
```

Add the factory alongside the other `create_*_block` helpers (e.g., after `create_divider_block`):
```python
def create_image_block(alt: str, target: str) -> Dict[str, Any]:
    """Image block in external shape. Local targets are converted to
    file_upload shape later by ntn_files.materialize_local_media."""
    block: Dict[str, Any] = {
        "object": "block",
        "type": "image",
        "image": {"type": "external", "external": {"url": target}},
    }
    if alt:
        block["image"]["caption"] = parse_rich_text(alt)
    return block
```

- [ ] **Step 4: Add the image detector to `_parse_lines`**

In `_parse_lines`, add this branch **before** the table detector (before the `if _is_table_row(line)...` line near line 213), so a standalone image line is caught before other block detectors:
```python
        image_match = IMAGE_RE.match(line)
        if image_match:
            blocks.append(create_image_block(
                image_match.group(1), image_match.group(2)))
            i += 1
            continue
```

- [ ] **Step 5: Run tests to verify they pass**

Run: `venv/bin/python test_parser.py`
Expected: `✅ All 35 tests passed` (32 existing + 3 new).

- [ ] **Step 6: Commit**

```bash
cd ~/Project/our-claude-skills
git add custom-skills/32-notion-writer/code/scripts/notion_writer.py \
        custom-skills/32-notion-writer/code/scripts/test_parser.py
git commit -m "$(printf 'feat(notion-writer): parse standalone images to image blocks\n\nCo-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>')"
```

---

### Task 4: `materialize_local_media` walk

**Files:**
- Modify: `custom-skills/32-notion-writer/code/scripts/ntn_files.py`
- Test: `custom-skills/32-notion-writer/code/scripts/test_ntn_files.py`

**Interfaces:**
- Consumes: `create_image_block` output shape (`block["image"]["external"]["url"]`).
- Produces:
  - `materialize_local_media(blocks, base_dir, upload_fn=upload) -> list` — recursively walks blocks + nested `children`. For each `image` block whose `external.url` is not `http(s):` and resolves (relative to `base_dir`, or absolute) to an existing file, calls `upload_fn(resolved_path)` and rewrites the block to file_upload shape. Missing local file raises `NtnUploadError`. Remote/external untouched. `upload_fn` is injectable for testing.

- [ ] **Step 1: Write the failing tests**

Add to `test_ntn_files.py` (and register in `run_all`):
```python
def _img(url):
    return {"object": "block", "type": "image",
            "image": {"type": "external", "external": {"url": url}}}


def test_materialize_remote_untouched():
    blocks = [_img("https://ex.com/a.png")]
    out = ntn_files.materialize_local_media(
        blocks, Path("/tmp"), upload_fn=lambda p: "SHOULD_NOT_RUN")
    assert out[0]["image"]["type"] == "external"


def test_materialize_local_uploaded(tmp_path=None):
    import tempfile, os
    d = Path(tempfile.mkdtemp())
    (d / "x.png").write_bytes(b"fake")
    blocks = [_img("x.png")]
    out = ntn_files.materialize_local_media(
        blocks, d, upload_fn=lambda p: "UP123")
    assert out[0]["image"]["type"] == "file_upload"
    assert out[0]["image"]["file_upload"]["id"] == "UP123"


def test_materialize_nested_children():
    import tempfile
    d = Path(tempfile.mkdtemp())
    (d / "y.png").write_bytes(b"fake")
    toggle = {"object": "block", "type": "toggle",
              "toggle": {"rich_text": [], "children": [_img("y.png")]}}
    out = ntn_files.materialize_local_media(
        [toggle], d, upload_fn=lambda p: "UPNESTED")
    child = out[0]["toggle"]["children"][0]
    assert child["image"]["file_upload"]["id"] == "UPNESTED"


def test_materialize_missing_file_raises():
    blocks = [_img("nope.png")]
    try:
        ntn_files.materialize_local_media(
            blocks, Path("/tmp"), upload_fn=lambda p: "x")
        assert False, "expected NtnUploadError"
    except NtnUploadError as e:
        assert "nope.png" in str(e) or "nope.png" in e.path
```

Register in `run_all`'s `tests` list:
```python
        test_materialize_remote_untouched,
        test_materialize_local_uploaded,
        test_materialize_nested_children,
        test_materialize_missing_file_raises,
```

- [ ] **Step 2: Run tests to verify they fail**

Run: `venv/bin/python test_ntn_files.py`
Expected: FAIL — `AttributeError: module 'ntn_files' has no attribute 'materialize_local_media'`.

- [ ] **Step 3: Implement the walk**

Append to `ntn_files.py`:
```python
_REMOTE_PREFIXES = ("http://", "https://")


def _resolve_local(url: str, base_dir: Path) -> Optional[Path]:
    """Return the resolved path for a local media url, or None if remote."""
    if url.startswith(_REMOTE_PREFIXES):
        return None
    p = Path(url)
    return p if p.is_absolute() else Path(base_dir) / p


def materialize_local_media(
    blocks: List[Dict[str, Any]],
    base_dir: Path,
    upload_fn: Callable[[Path], str] = upload,
) -> List[Dict[str, Any]]:
    """Walk blocks (and nested children); upload local image files and
    rewrite them to file_upload shape. Remote images are left as-is."""
    for block in blocks:
        if block.get("type") == "image":
            img = block["image"]
            if img.get("type") == "external":
                url = img.get("external", {}).get("url", "")
                resolved = _resolve_local(url, base_dir)
                if resolved is not None:
                    if not resolved.is_file():
                        raise NtnUploadError(
                            f"image references missing file: {url}",
                            path=str(resolved),
                        )
                    upload_id = upload_fn(resolved)
                    caption = img.get("caption")
                    new_img: Dict[str, Any] = {
                        "type": "file_upload",
                        "file_upload": {"id": upload_id},
                    }
                    if caption:
                        new_img["caption"] = caption
                    block["image"] = new_img
        # Recurse into any nested children list.
        btype = block.get("type")
        nested = block.get(btype, {}) if isinstance(block.get(btype), dict) else {}
        if isinstance(nested.get("children"), list):
            materialize_local_media(nested["children"], base_dir, upload_fn)
        if btype == "column_list":
            for col in nested.get("children", []):
                col_children = col.get("column", {}).get("children", [])
                materialize_local_media(col_children, base_dir, upload_fn)
    return blocks
```

- [ ] **Step 4: Run tests to verify they pass**

Run: `venv/bin/python test_ntn_files.py`
Expected: `✅ All 8 tests passed`.

- [ ] **Step 5: Commit**

```bash
cd ~/Project/our-claude-skills
git add custom-skills/32-notion-writer/code/scripts/ntn_files.py \
        custom-skills/32-notion-writer/code/scripts/test_ntn_files.py
git commit -m "$(printf 'feat(notion-writer): materialize local images via upload walk\n\nCo-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>')"
```

---

### Task 5: `md_translate.py` — dialect translator

**Files:**
- Create: `custom-skills/32-notion-writer/code/scripts/md_translate.py`
- Test: `custom-skills/32-notion-writer/code/scripts/test_md_translate.py`

**Interfaces:**
- Consumes: `notion_writer.extract_notion_id` (existing) for mention resolution.
- Produces: `translate(content: str) -> str` — converts skill dialect to Notion enhanced markdown. Pure.

Translation rules (everything not listed passes through unchanged): GitHub alert `> [!TYPE]` block → `<callout icon=... color="..._bg">` with tab-indented body; Pandoc `::: columns/column/:::` → `<columns>/<column>` with tab-indented children; `<details>`/`<summary>` toggle → children re-indented one tab; inline `@[Title](id|url)` → `<mention-page url="...">Title</mention-page>` (unresolvable → plain `@Title`).

- [ ] **Step 1: Write the failing tests**

Create `test_md_translate.py`:
```python
#!/usr/bin/env python3
"""Tests for md_translate.py — run with `python test_md_translate.py`."""

import sys
from pathlib import Path

sys.path.insert(0, str(Path(__file__).parent))

import md_translate


def test_passthrough_basics():
    src = "# Heading\n\n- item\n\n```python\nx=1\n```"
    assert md_translate.translate(src) == src


def test_callout_note():
    out = md_translate.translate("> [!NOTE]\n> Be careful")
    assert '<callout icon="ℹ️" color="blue_bg">' in out
    assert "\tBe careful" in out
    assert "</callout>" in out


def test_callout_warning_color():
    out = md_translate.translate("> [!WARNING]\n> Danger")
    assert 'color="yellow_bg"' in out
    assert 'icon="⚠️"' in out


def test_columns():
    src = "::: columns\n::: column\nLeft\n:::\n::: column\nRight\n:::\n:::"
    out = md_translate.translate(src)
    assert "<columns>" in out
    assert out.count("<column>") == 2
    assert "</columns>" in out
    assert "\tLeft" in out or "\t\tLeft" in out


def test_toggle_children_indented():
    src = "<details>\n<summary>More</summary>\nBody line\n</details>"
    out = md_translate.translate(src)
    assert "<summary>More</summary>" in out
    assert "\tBody line" in out


def test_mention_url():
    out = md_translate.translate(
        "See @[ADR](https://notion.so/X-abcdef0123456789abcdef0123456789).")
    assert "<mention-page url=" in out
    assert ">ADR</mention-page>" in out


def test_mention_invalid_plain():
    out = md_translate.translate("ping @[Bob](not-an-id)")
    assert "@Bob" in out
    assert "mention-page" not in out


def run_all():
    tests = [
        test_passthrough_basics,
        test_callout_note,
        test_callout_warning_color,
        test_columns,
        test_toggle_children_indented,
        test_mention_url,
        test_mention_invalid_plain,
    ]
    for t in tests:
        print(f"\n{t.__name__}")
        t()
    print("\n" + "=" * 50)
    print(f"✅ All {len(tests)} tests passed")
    print("=" * 50)


if __name__ == "__main__":
    run_all()
```

- [ ] **Step 2: Run tests to verify they fail**

Run: `venv/bin/python test_md_translate.py`
Expected: FAIL with `ModuleNotFoundError: No module named 'md_translate'`.

- [ ] **Step 3: Implement `md_translate.py`**

Create `md_translate.py`:
```python
#!/usr/bin/env python3
"""Translate the notion-writer markdown dialect into Notion enhanced
markdown for the markdown write engine. Pure functions, no I/O."""

from __future__ import annotations

import re
from typing import List

# NOTE: `notion_writer` is imported lazily inside _translate_mentions to avoid
# a circular import (notion_writer imports this module at its top level).

# Skill alert type -> (emoji, Notion enhanced-markdown background color)
CALLOUT_MAP = {
    "NOTE": ("ℹ️", "blue_bg"),
    "TIP": ("💡", "green_bg"),
    "IMPORTANT": ("☝️", "purple_bg"),
    "WARNING": ("⚠️", "yellow_bg"),
    "CAUTION": ("🚨", "red_bg"),
}
_ALERT_RE = re.compile(r'^\s*\[!(NOTE|TIP|IMPORTANT|WARNING|CAUTION)\]\s*$')
_MENTION_RE = re.compile(r'@\[([^\]]+)\]\(([^)\s]+)\)')


def _translate_mentions(text: str) -> str:
    from notion_writer import extract_notion_id, format_id_with_dashes  # lazy: breaks import cycle

    def repl(m: "re.Match") -> str:
        title, target = m.group(1), m.group(2)
        page_id = extract_notion_id(target)
        if page_id:
            return (f'<mention-page url="{format_id_with_dashes(page_id)}">'
                    f'{title}</mention-page>')
        return f"@{title}"
    return _MENTION_RE.sub(repl, text)


def _indent(lines: List[str]) -> List[str]:
    return ["\t" + ln if ln.strip() else ln for ln in lines]


def translate(content: str) -> str:
    lines = content.split("\n")
    out: List[str] = []
    i = 0
    while i < len(lines):
        line = lines[i]

        # Callout: > [!TYPE] then contiguous > body lines
        if line.lstrip().startswith(">"):
            body_first = line.lstrip()[1:].strip()
            alert = _ALERT_RE.match(body_first)
            if alert:
                emoji, color = CALLOUT_MAP[alert.group(1)]
                i += 1
                body: List[str] = []
                while i < len(lines) and lines[i].lstrip().startswith(">"):
                    body.append(lines[i].lstrip()[1:].lstrip())
                    i += 1
                out.append(f'<callout icon="{emoji}" color="{color}">')
                out.extend(_indent([_translate_mentions(b) for b in body]))
                out.append("</callout>")
                continue

        # Columns: ::: columns / ::: column / :::
        # State machine: "::: column" opens a column; ":::" closes a column
        # when one is open, otherwise closes the wrapper. The Pandoc layout
        # emits N "::: column" opens, N ":::" column-closes, then one final
        # ":::" wrapper-close.
        if line.strip() == "::: columns":
            i += 1
            cols: List[List[str]] = []
            cur: List[str] = None
            while i < len(lines):
                s = lines[i].strip()
                if s == "::: column":
                    if cur is not None:
                        cols.append(cur)
                    cur = []
                    i += 1
                elif s == ":::":
                    if cur is not None:      # close the open column
                        cols.append(cur)
                        cur = None
                        i += 1
                    else:                    # close the wrapper
                        i += 1
                        break
                else:
                    if cur is not None:
                        cur.append(lines[i])
                    i += 1
            out.append("<columns>")
            for col in cols:
                out.append("\t<column>")
                out.extend(_indent(_indent(
                    [_translate_mentions(c) for c in col])))
                out.append("\t</column>")
            out.append("</columns>")
            continue

        # Toggle: <details><summary>..</summary> body </details>
        if line.strip() == "<details>":
            out.append("<details>")
            i += 1
            if i < len(lines) and lines[i].lstrip().startswith("<summary>"):
                out.append(lines[i].strip())
                i += 1
            body = []
            while i < len(lines) and lines[i].strip() != "</details>":
                body.append(_translate_mentions(lines[i]))
                i += 1
            out.extend(_indent(body))
            out.append("</details>")
            if i < len(lines):  # skip closing </details>
                i += 1
            continue

        out.append(_translate_mentions(line))
        i += 1
    return "\n".join(out)
```

- [ ] **Step 4: Run tests to verify they pass**

Run: `venv/bin/python test_md_translate.py`
Expected: `✅ All 7 tests passed`.

- [ ] **Step 5: Confirm the parser suite still passes (no import cycle)**

Run: `venv/bin/python test_parser.py`
Expected: `✅ All 35 tests passed` (importing `md_translate` must not break `notion_writer`).

- [ ] **Step 6: Commit**

```bash
cd ~/Project/our-claude-skills
git add custom-skills/32-notion-writer/code/scripts/md_translate.py \
        custom-skills/32-notion-writer/code/scripts/test_md_translate.py
git commit -m "$(printf 'feat(notion-writer): dialect->Notion enhanced markdown translator\n\nCo-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>')"
```

---

### Task 6: `_notion_compat.py` markdown helpers + version-aware client

**Files:**
- Modify: `custom-skills/32-notion-writer/code/scripts/_notion_compat.py`
- Test: `custom-skills/32-notion-writer/code/scripts/test_engine_routing.py`

**Interfaces:**
- Consumes: `notion_client.Client.request(path, method, body)`.
- Produces:
  - `make_client(api_key, notion_version=None) -> Client` (adds optional version).
  - `create_page_markdown(client, parent, properties, markdown) -> dict` → `request("pages", "POST", body={parent, properties, markdown})`.
  - `append_markdown(client, page_id, markdown) -> dict` → `request(f"pages/{page_id}/markdown", "PATCH", body={"type":"insert_content","insert_content":{"content":markdown,"position":{"type":"end"}}})`.
  - `replace_markdown(client, page_id, markdown, allow_deleting=False) -> dict` → `request(f"pages/{page_id}/markdown", "PATCH", body={"type":"replace_content","replace_content":{"new_str":markdown,"allow_deleting_content":allow_deleting}})`.

- [ ] **Step 1: Write the failing tests**

Create `test_engine_routing.py`:
```python
#!/usr/bin/env python3
"""Tests for markdown transport helpers — run with `python test_engine_routing.py`."""

import sys
from pathlib import Path
from unittest import mock

sys.path.insert(0, str(Path(__file__).parent))

import _notion_compat as compat


def _fake_client():
    c = mock.MagicMock()
    c.request.return_value = {"object": "page", "id": "p1"}
    return c


def test_create_page_markdown():
    c = _fake_client()
    parent = {"type": "data_source_id", "data_source_id": "ds1"}
    compat.create_page_markdown(c, parent, {"Name": {"title": []}}, "# Hi")
    _, kwargs = c.request.call_args
    assert kwargs["path"] == "pages"
    assert kwargs["method"] == "POST"
    assert kwargs["body"]["markdown"] == "# Hi"
    assert kwargs["body"]["parent"] == parent


def test_append_markdown():
    c = _fake_client()
    compat.append_markdown(c, "page-123", "## More")
    _, kwargs = c.request.call_args
    assert kwargs["path"] == "pages/page-123/markdown"
    assert kwargs["method"] == "PATCH"
    assert kwargs["body"]["type"] == "insert_content"
    assert kwargs["body"]["insert_content"]["content"] == "## More"
    assert kwargs["body"]["insert_content"]["position"] == {"type": "end"}


def test_replace_markdown():
    c = _fake_client()
    compat.replace_markdown(c, "page-123", "# Fresh", allow_deleting=True)
    _, kwargs = c.request.call_args
    assert kwargs["path"] == "pages/page-123/markdown"
    assert kwargs["body"]["type"] == "replace_content"
    assert kwargs["body"]["replace_content"]["new_str"] == "# Fresh"
    assert kwargs["body"]["replace_content"]["allow_deleting_content"] is True


def run_all():
    tests = [
        test_create_page_markdown,
        test_append_markdown,
        test_replace_markdown,
    ]
    for t in tests:
        print(f"\n{t.__name__}")
        t()
    print("\n" + "=" * 50)
    print(f"✅ All {len(tests)} tests passed")
    print("=" * 50)


if __name__ == "__main__":
    run_all()
```

- [ ] **Step 2: Run tests to verify they fail**

Run: `venv/bin/python test_engine_routing.py`
Expected: FAIL — `AttributeError: module '_notion_compat' has no attribute 'create_page_markdown'`.

- [ ] **Step 3: Implement the helpers**

In `_notion_compat.py`, replace `make_client` (lines 19-21) with:
```python
def make_client(api_key: str, notion_version: str = None) -> Client:
    """Build a sync Notion client. Pass notion_version to override the SDK
    default (needed: 2026-03-11 for the markdown content endpoints)."""
    if notion_version:
        return Client(auth=api_key, notion_version=notion_version)
    return Client(auth=api_key)
```

Add at the end of `_notion_compat.py`:
```python
def create_page_markdown(client, parent, properties, markdown):
    """POST /v1/pages with the enhanced-markdown body param."""
    return client.request(
        path="pages", method="POST",
        body={"parent": parent, "properties": properties, "markdown": markdown},
    )


def append_markdown(client, page_id, markdown):
    """PATCH /v1/pages/:id/markdown — append at end (insert_content)."""
    return client.request(
        path=f"pages/{page_id}/markdown", method="PATCH",
        body={"type": "insert_content",
              "insert_content": {"content": markdown,
                                 "position": {"type": "end"}}},
    )


def replace_markdown(client, page_id, markdown, allow_deleting=False):
    """PATCH /v1/pages/:id/markdown — replace all content."""
    return client.request(
        path=f"pages/{page_id}/markdown", method="PATCH",
        body={"type": "replace_content",
              "replace_content": {"new_str": markdown,
                                  "allow_deleting_content": allow_deleting}},
    )
```

Also extend the `ValidationError` branch of `explain_api_error` (currently lines ~212-213) so markdown-replace deletion errors are actionable. Replace:
```python
    if code == APIErrorCode.ValidationError:
        return f"Validation error{suffix}: {exc.body.get('message', str(exc))}"
```
with:
```python
    if code == APIErrorCode.ValidationError:
        msg = exc.body.get('message', str(exc))
        if 'delet' in msg.lower():
            msg += " — re-run with --allow-deleting-content to permit this."
        return f"Validation error{suffix}: {msg}"
```

- [ ] **Step 4: Run tests to verify they pass**

Run: `venv/bin/python test_engine_routing.py`
Expected: `✅ All 3 tests passed`.

- [ ] **Step 5: Confirm no regression**

Run: `venv/bin/python test_parser.py`
Expected: `✅ All 35 tests passed`.

- [ ] **Step 6: Commit**

```bash
cd ~/Project/our-claude-skills
git add custom-skills/32-notion-writer/code/scripts/_notion_compat.py \
        custom-skills/32-notion-writer/code/scripts/test_engine_routing.py
git commit -m "$(printf 'feat(notion-writer): markdown endpoint helpers + version-aware client\n\nCo-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>')"
```

---

### Task 7: Wire the CLI — flags, routing, two-phase image append

**Files:**
- Modify: `custom-skills/32-notion-writer/code/scripts/notion_writer.py`
- Test: `custom-skills/32-notion-writer/code/scripts/test_engine_routing.py`

**Interfaces:**
- Consumes: `ntn_files.preflight/upload/materialize_local_media`, `md_translate.translate`, `compat.create_page_markdown/append_markdown/replace_markdown`, `compat.make_client(..., notion_version=...)`.
- Produces:
  - `extract_local_images(content: str) -> tuple[str, list[tuple[str, str]]]` — removes standalone local (`!http`) image lines, returns `(content_without_local_images, [(alt, target), ...])`.
  - `_content_has_local_images(content: str) -> bool`.
  - `--engine`, `--notion-version`, `--allow-deleting-content` argparse flags.
  - `MARKDOWN_NOTION_VERSION = "2026-03-11"` constant.

- [ ] **Step 1: Write the failing tests**

Add to `test_engine_routing.py` (register names in `run_all`). These import from `notion_writer` and exercise the pure helpers:
```python
import notion_writer


def test_extract_local_images_splits():
    content = ("# Title\n\n![remote](https://ex.com/a.png)\n\n"
               "![local](./b.png)\n\nbody")
    without, imgs = notion_writer.extract_local_images(content)
    assert imgs == [("local", "./b.png")]
    assert "![local](./b.png)" not in without
    assert "![remote](https://ex.com/a.png)" in without  # remote stays


def test_content_has_local_images():
    assert notion_writer._content_has_local_images("![x](./y.png)") is True
    assert notion_writer._content_has_local_images("![x](https://e/y.png)") is False
    assert notion_writer._content_has_local_images("no images") is False
```

Add to `run_all`'s `tests` list:
```python
        test_extract_local_images_splits,
        test_content_has_local_images,
```

- [ ] **Step 2: Run tests to verify they fail**

Run: `venv/bin/python test_engine_routing.py`
Expected: FAIL — `AttributeError: module 'notion_writer' has no attribute 'extract_local_images'`.

- [ ] **Step 3: Add imports + helpers + constant**

Near the top of `notion_writer.py`, after `import _notion_compat as compat` (line 19), add:
```python
import ntn_files
import md_translate

MARKDOWN_NOTION_VERSION = "2026-03-11"
```

Add these helpers near `create_image_block`:
```python
def _content_has_local_images(content: str) -> bool:
    for line in content.split('\n'):
        m = IMAGE_RE.match(line)
        if m and not m.group(2).startswith(('http://', 'https://')):
            return True
    return False


def extract_local_images(content: str):
    """Remove standalone LOCAL image lines; keep remote ones inline.
    Returns (content_without_local_images, [(alt, target), ...])."""
    kept, imgs = [], []
    for line in content.split('\n'):
        m = IMAGE_RE.match(line)
        if m and not m.group(2).startswith(('http://', 'https://')):
            imgs.append((m.group(1), m.group(2)))
            continue
        kept.append(line)
    return "\n".join(kept), imgs
```

- [ ] **Step 4: Run the new pure-helper tests**

Run: `venv/bin/python test_engine_routing.py`
Expected: `✅ All 5 tests passed`.

- [ ] **Step 5: Add the argparse flags**

In `main()`, after the `--info` argument (around line 798), add:
```python
    parser.add_argument('--engine', choices=['blocks', 'markdown'],
                        default='blocks',
                        help='Write engine: blocks (default) or markdown')
    parser.add_argument('--notion-version', dest='notion_version',
                        help='Override Notion API version')
    parser.add_argument('--allow-deleting-content', dest='allow_deleting',
                        action='store_true',
                        help='Markdown replace may delete child pages/dbs')
```

- [ ] **Step 6: Add a base-dir helper + media-client wiring in `main()`**

In `main()`, right after `content` is resolved (after the `elif args.file:` block near line 886), add:
```python
    base_dir = Path(args.file).parent if args.file else Path.cwd()

    def _md_client():
        version = args.notion_version or MARKDOWN_NOTION_VERSION
        return compat.make_client(NOTION_TOKEN, notion_version=version)

    def _upload_blocks_for(images):
        """Build + materialize image blocks for two-phase markdown writes."""
        blocks = [create_image_block(alt, target) for alt, target in images]
        return ntn_files.materialize_local_media(blocks, base_dir, ntn_files.upload)
```

- [ ] **Step 7: Route the page-write path through the engine**

Replace the page-write block in `main()` (the `if args.page:` block, lines ~889-909) with:
```python
    if args.page:
        if not content:
            print("Error: No content provided. Use --file or --stdin")
            sys.exit(1)
        page_id = extract_notion_id(args.page)
        if not page_id:
            print(f"Error: Invalid Notion page URL/ID: {args.page}")
            sys.exit(1)
        formatted_id = format_id_with_dashes(page_id)

        if args.engine == 'markdown':
            if _content_has_local_images(content):
                ntn_files.preflight()
            md_body, local_imgs = extract_local_images(content)
            md_body = md_translate.translate(md_body)
            mc = _md_client()
            try:
                if args.replace:
                    compat.replace_markdown(mc, formatted_id, md_body,
                                            allow_deleting=args.allow_deleting)
                else:
                    compat.append_markdown(mc, formatted_id, md_body)
            except APIResponseError as exc:
                print(f"Error: {compat.explain_api_error(exc, formatted_id)}")
                sys.exit(1)
            if local_imgs:
                append_to_page(notion, page_id, _upload_blocks_for(local_imgs))
            print("✅ Successfully wrote content to page (markdown engine)")
            print(f"   https://notion.so/{formatted_id.replace('-', '')}")
            return

        # blocks engine (default)
        blocks = markdown_to_notion_blocks(content)
        if _content_has_local_images(content):
            ntn_files.preflight()
            blocks = ntn_files.materialize_local_media(blocks, base_dir, ntn_files.upload)
        if not blocks:
            print("No content to write")
            sys.exit(1)
        if args.replace and not clear_page_content(notion, page_id):
            sys.exit(1)
        if append_to_page(notion, page_id, blocks):
            print("✅ Successfully wrote content to page")
            print(f"   https://notion.so/{formatted_id.replace('-', '')}")
        else:
            print("❌ Failed to write content")
            sys.exit(1)
        return
```

- [ ] **Step 8: Route the database-row path through the engine**

In the `if args.database:` block, after `content_blocks = markdown_to_notion_blocks(content) if content else None` (line ~961), insert the markdown-engine branch and guard the blocks-engine upload. Replace that line and the create/upsert tail with:
```python
        if args.engine == 'markdown':
            md_content = content or ""
            if _content_has_local_images(md_content):
                ntn_files.preflight()
            md_body, local_imgs = extract_local_images(md_content)
            md_body = md_translate.translate(md_body)
            parent = compat.build_data_source_parent(data_source_id)
            mc = _md_client()
            try:
                if args.upsert_by and 'existing' in dir() and existing:
                    compat.replace_markdown(mc, existing['id'], md_body,
                                            allow_deleting=args.allow_deleting)
                    update_page_properties(notion, existing['id'], properties)
                    new_id = existing['id']
                else:
                    result = compat.create_page_markdown(mc, parent, properties, md_body)
                    new_id = result['id']
            except APIResponseError as exc:
                print(f"Error: {compat.explain_api_error(exc)}")
                sys.exit(1)
            if local_imgs:
                append_to_page(notion, new_id, _upload_blocks_for(local_imgs))
            print("✅ Successfully wrote database row (markdown engine)")
            print(f"   https://notion.so/{new_id.replace('-', '')}")
            return

        content_blocks = markdown_to_notion_blocks(content) if content else None
        if content_blocks and _content_has_local_images(content or ""):
            ntn_files.preflight()
            content_blocks = ntn_files.materialize_local_media(
                content_blocks, base_dir, ntn_files.upload)
```

> Note: the existing upsert lookup that defines `existing` runs earlier in this block (the `if args.upsert_by:` section). Keep that section above this code so `existing` is in scope. If the markdown branch runs before that section in the current file order, move the markdown branch to just after the upsert lookup. The blocks-engine create/upsert tail below stays unchanged.

- [ ] **Step 9: Run all suites**

Run:
```bash
venv/bin/python test_parser.py && \
venv/bin/python test_ntn_files.py && \
venv/bin/python test_md_translate.py && \
venv/bin/python test_engine_routing.py
```
Expected: every suite prints its `✅ All N tests passed` line (35, 8, 7, 5).

- [ ] **Step 10: Smoke-check the CLI help (no API calls)**

Run: `venv/bin/python notion_writer.py --help`
Expected: help text lists `--engine`, `--notion-version`, `--allow-deleting-content`.

- [ ] **Step 11: Commit**

```bash
cd ~/Project/our-claude-skills
git add custom-skills/32-notion-writer/code/scripts/notion_writer.py \
        custom-skills/32-notion-writer/code/scripts/test_engine_routing.py
git commit -m "$(printf 'feat(notion-writer): --engine routing + two-phase image append\n\nCo-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>')"
```

---

### Task 8: Documentation (CLAUDE.md + SKILL.md, v1.3.0)

**Files:**
- Modify: `custom-skills/32-notion-writer/code/CLAUDE.md`
- Modify: `custom-skills/32-notion-writer/SKILL.md`

**Interfaces:** none (docs only).

- [ ] **Step 1: Document the new capabilities in `code/CLAUDE.md`**

Add a "File uploads" subsection under Markdown Support describing `![alt](local.png)` auto-upload via `ntn` (requires `ntn` installed + `ntn login`; workspace-scoped). Add an "Engines" subsection: `--engine blocks` (default) vs `--engine markdown` (native endpoints, `2026-03-11`, dialect auto-translated, local images appended at page end). Document `--notion-version` and `--allow-deleting-content`. Add example:
```bash
# Markdown engine, create a row from a doc with callouts/columns
python notion_writer.py -d DB_URL -t "Notes" --engine markdown -f notes.md

# Blocks engine with a local image (auto-uploaded via ntn)
python notion_writer.py -p PAGE_URL -f post.md   # post.md contains ![chart](./chart.png)
```

- [ ] **Step 2: Bump the version footer in `code/CLAUDE.md`**

Change the footer line to `*Version 1.3.0 | Claude Code | 2026-06-27*` and add a changelog entry:
```markdown
- 1.3.0 — Local file/image uploads via the `ntn` CLI (`![](local)` → file_upload image blocks). New `--engine markdown` path writing through Notion's native enhanced-markdown endpoints with a dialect translator. Added `--notion-version` and `--allow-deleting-content`.
```

- [ ] **Step 3: Mirror the summary into `SKILL.md`**

Under the "Supported Markdown" / capabilities area of `SKILL.md`, add a one-paragraph note on engines and image upload, with the `--engine markdown` example above. Keep it short — `SKILL.md` is the trigger surface.

- [ ] **Step 4: Commit**

```bash
cd ~/Project/our-claude-skills
git add custom-skills/32-notion-writer/code/CLAUDE.md \
        custom-skills/32-notion-writer/SKILL.md
git commit -m "$(printf 'docs(notion-writer): document engines + file uploads (v1.3.0)\n\nCo-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>')"
```

---

### Task 9: Live smoke test (both engines)

**Files:** none (manual verification against the live API).

**Interfaces:** uses the real `NOTION_API_KEY` (1Password) and the "Working with AI" data source `f8f19ede-32bd-43ac-9f60-0651f6f40afe`.

- [ ] **Step 1: Connection + token**

Run:
```bash
cd ~/Project/our-claude-skills/custom-skills/32-notion-writer/code/scripts
NOTION_API_KEY="$(op read 'op://Development/Notion - Claude Agent/api-key')" \
  venv/bin/python notion_writer.py --test
```
Expected: `✅ Connected successfully!`. If the 1Password item path differs, use the working credential path from SKILL.md's "Credential handling".

- [ ] **Step 2: Blocks engine — local image upload**

Create `/tmp/nw_img.md` with a heading and `![smoke](./logo.png)` (place any small PNG at `./logo.png` in the scripts dir). Run an upsert into the AI DB:
```bash
NOTION_API_KEY="$(op read 'op://Development/Notion - Claude Agent/api-key')" \
  venv/bin/python notion_writer.py -d f8f19ede-32bd-43ac-9f60-0651f6f40afe \
  -t "[smoke] blocks image" --upsert-by "Name" -f /tmp/nw_img.md
```
Expected: prints the `ntn -> workspace` line and a success URL; the row shows an embedded image (not a broken link). **Verify the `ntn` workspace line matches the token's workspace** — if not, the image won't attach (documented constraint).

- [ ] **Step 3: Markdown engine — callout + columns + appended image**

Create `/tmp/nw_md.md`:
```markdown
# Smoke: markdown engine

> [!NOTE]
> Rendered as a Notion callout.

::: columns
::: column
Left column
:::
::: column
Right column
:::
:::

![smoke](./logo.png)
```
Run:
```bash
NOTION_API_KEY="$(op read 'op://Development/Notion - Claude Agent/api-key')" \
  venv/bin/python notion_writer.py -d f8f19ede-32bd-43ac-9f60-0651f6f40afe \
  -t "[smoke] markdown engine" --upsert-by "Name" --engine markdown -f /tmp/nw_md.md
```
Expected: success URL; the page shows a callout, two columns, and the image at the end. **This confirms the open pipe-table/version items** — if the callout or columns render as raw text, check the translator's tab indentation; if the API rejects the body, check the `2026-03-11` version and the data-source parent.

- [ ] **Step 4: Markdown engine — replace**

Run the same command as Step 3 but with `-p <the page URL from Step 3>`, `--engine markdown`, `--replace`, and a trivial `/tmp/nw_md2.md` (`# Replaced\nNew body.`):
```bash
NOTION_API_KEY="$(op read 'op://Development/Notion - Claude Agent/api-key')" \
  venv/bin/python notion_writer.py -p PAGE_URL_FROM_STEP_3 \
  --engine markdown --replace -f /tmp/nw_md2.md
```
Expected: page content replaced via `replace_content`. If it errors about deleting child content, re-run with `--allow-deleting-content`.

- [ ] **Step 5: Record results**

If all four steps pass, the feature is verified end-to-end. If the pipe-table passthrough failed in Step 3, open a follow-up per the spec's parking lot (`<table>` rewrite). No commit (manual test task).

---

## Notes for the implementer

- **Run from the scripts dir.** All `venv/bin/python ...` commands assume cwd = `custom-skills/32-notion-writer/code/scripts/`.
- **Line numbers** in "Modify" hints are from the current `notion_writer.py` (1013 lines) and `_notion_compat.py` (256 lines); if they've drifted, locate by the quoted anchor code instead.
- **Don't reformat** untouched code. Keep diffs minimal and additive.
- After Task 7, the four suites total 55 tests (35 + 8 + 7 + 5). Keep them all green through Tasks 8-9.