feat(skills): bulk-add root SKILL.md to 61 skills (native Agent Skills loadability)

Run the additive migration pass from SKILL-MIGRATION-GUIDE: generate a root SKILL.md
for every skill that lacked one, copied from its desktop/SKILL.md (or code/SKILL.md),
with name set to the directory name and description + body preserved verbatim.

- scripts/migrate_skill_root.py: the reusable, non-destructive migrator (dry-run default).
- 61 new root SKILL.md (desktop source for most; code/SKILL.md for 61/62/92).
- Untouched: 16/17/95 (already had root); desktop/ and code/ packaging left intact.
- All 64 root SKILL.md validate: frontmatter <=1024, kebab name, description present.

Still MANUAL (no SKILL.md source — commands/README only), need hand-authored root SKILL.md:
81-mac-optimizer, 90-reference-curator, 91-multi-agent-guide, 94-dintel-bootstrap.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

custom-skills/82-our-gdrive-organizer/SKILL.md

@@ -0,0 +1,103 @@
+---
+name: 82-our-gdrive-organizer
+description: |
+  Organize a Google Drive folder under OurDigital conventions: refresh the
+  root README.md index, refresh per-subfolder README.md meta files, propose
+  filename normalizations (D.intelligence → OurDigital, client name → OOO
+  placeholder), and propose moves for cluttered files (screenshots, temp
+  downloads).
+
+  Triggers:
+  - "organize the Drive folder", "organize this folder"
+  - "refresh the index", "rescan the folder", "update README"
+  - "clean up cluttered files", "propose renames"
+  - "/organize", "/our-gdrive-organizer"
+
+  Designed for any 2nd-level Drive folder (not specific to one project).
+  In Claude Desktop, this is a guide — the actual filesystem operations
+  are performed by the user via the bundled `organizer.py` CLI in a terminal,
+  or by Claude with a filesystem MCP tool if available.
+version: "1.0"
+author: OurDigital
+environment: Desktop
+---
+
+# our-gdrive-organizer (Desktop)
+
+Guide for organizing a Drive folder under OurDigital naming + structure
+conventions. In Claude Desktop without filesystem write access, walk the user
+through running the bundled CLI script themselves.
+
+## Activation
+
+User says any of:
+- "organize my Drive folder"
+- "refresh the index README"
+- "scan for changes and update the README"
+- "rename files to follow OurDigital convention"
+- "/organize" (slash command)
+
+## Workflow
+
+### Step 1 — Identify the target folder
+
+Ask the user which folder they want to organize, or assume the conversation's
+current 2nd-level Drive folder (e.g., `02_SEO in Action/`,
+`01_Brand in Action/`, `00_OurDigital/`).
+
+### Step 2 — Have the user run the CLI
+
+The Python script lives in the user's local `~/Project/our-claude-skills/`
+repo and is symlinked to `~/.local/bin/our-gdrive-organize`. The user runs:
+
+```bash
+our-gdrive-organize "/Users/ourdigital/Library/CloudStorage/GoogleDrive-andrew.yim@ourdigital.org/My Drive/NN_FolderName"
+```
+
+This is a dry-run by default. It always writes the README index (idempotent),
+and it prints proposals for renames and moves without applying them.
+
+Ask the user to paste back the report.
+
+### Step 3 — Summarize and confirm
+
+Read the report, summarize each proposed rename and move in plain language, and
+ask the user which (if any) they want to apply. They can apply all:
+
+```bash
+our-gdrive-organize "/path/to/folder" --apply
+```
+
+Or just one scope at a time:
+
+```bash
+our-gdrive-organize "/path/to/folder" --scope rename --apply
+out-gdrive-organize "/path/to/folder" --scope move --apply
+```
+
+## Important guardrails
+
+The script automatically skips invasive changes (renames, moves) inside:
+- `04_Case Studies/`
+- `99_Project Archive/`
+- Any folder ending in `Archive`
+- Any folder starting with `진단`
+
+These are client-engagement records that must keep their original filenames.
+If the user wants to override that, they need to edit
+`SENSITIVE_SUBFOLDER_PATTERNS` in `~/Project/our-claude-skills/custom-skills/our-gdrive-organizer/code/organizer.py`.
+
+## Naming convention
+
+See `../shared/conventions.md` for the canonical spec. Highlights:
+- `D.intelligence` → `OurDigital` (rebrand)
+- Client-specific quote/template files → `OurDigital-{topic}-OOO {date}.{ext}`
+- Top-level subfolders → `NN_descriptive name`
+- Client subfolders inside Active Workspaces / Project Archive → `NN_{client name}`
+
+## Troubleshooting
+
+- **"command not found: our-gdrive-organize"** — the symlink may not be set up.
+  Ask the user to run: `ln -s ~/Project/our-claude-skills/custom-skills/our-gdrive-organizer/code/organizer.py ~/.local/bin/our-gdrive-organize`
+- **Script changes README but the user doesn't see the update** — Google Drive
+  sync delay; usually 5-30 seconds.