feat(okf): add install.sh; changelog; e2e produce->validate->visualize verified

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

custom-skills/97-ourdigital-okf/docs/CHANGELOG.md

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+# Changelog — ourdigital-okf
+
+## 1.0 — 2026-06-16
+
+Initial release.
+
+- **produce** / **validate** / **visualize** modes for Open Knowledge Format (OKF) v0.1 bundles.
+- `okf_common.py` — stdlib YAML-subset frontmatter + link parser (inline/block lists, folded
+  and `>`/`|` block scalars, quoted scalars).
+- `okf_validate.py` — conformance (parseable frontmatter + non-empty `type`) + broken-link
+  warnings; text/JSON output; meaningful exit code.
+- `okf_viz.py` — minimal self-contained Cytoscape graph viewer (CDN libs, no backend).
+- Test suite: 20 stdlib `unittest` tests. Verified CONFORMANT against Google's reference
+  bundles (crypto_bitcoin, ga4, stackoverflow).
+- End-to-end verified: produce a 4-concept analytics bundle → validate (0 errors) →
+  visualize (4 nodes, 9 edges).
+- `install.sh` symlinks the skill into `~/.claude/skills/ourdigital-okf`.

custom-skills/97-ourdigital-okf/install.sh

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+#!/bin/bash
+# ourdigital-okf installer — symlinks the skill into ~/.claude/skills/ourdigital-okf
+set -e
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+SKILLS_DIR="$HOME/.claude/skills"
+TARGET="$SKILLS_DIR/ourdigital-okf"
+
+mkdir -p "$SKILLS_DIR"
+if [ -e "$TARGET" ] || [ -L "$TARGET" ]; then
+  echo "Removing existing $TARGET"
+  rm -rf "$TARGET"
+fi
+ln -s "$SCRIPT_DIR" "$TARGET"
+echo "Linked $TARGET -> $SCRIPT_DIR"
+echo "Verifying scripts (stdlib-only)…"
+python3 "$SCRIPT_DIR/code/scripts/okf_validate.py" \
+  "$SCRIPT_DIR/code/scripts/tests/fixtures/mini_bundle" >/dev/null && echo "validate OK"
+echo "Done. Invoke with /ourdigital-okf"