Add official Anthropic plugins, soften .env.example guard, sync docs

[AnExiledDev]

Summary

• Expanded official plugins — added code-review, feature-dev, and pr-review-toolkit from anthropics/claude-code; migrated all identifiers from @claude-plugins-official to @anthropics/claude-code
• Softened .env.example guard — protected-files-guard now allows editing .env.example while still blocking .env, .env.local, .env.production, etc.
• Docs accuracy sweep — plugin count 14→17 across 5 docs pages + README; fixed "fails open" → "fails closed" in protected-files-guard README; merged [Unreleased] changelog into v2.0.0 section; updated test counts 241→289

Files Changed (14)

• .codeforge/config/settings.json — 4 official plugins with new identifier format
• .devcontainer/scripts/setup-plugins.sh — DEFAULT_OFFICIAL_PLUGINS updated
• .devcontainer/CLAUDE.md — plugin list expanded
• .devcontainer/CHANGELOG.md — merged [Unreleased] into v2.0.0, deduped
• guard-protected.py + guard-protected-bash.py — .env.example negative lookahead
• protected-files-guard/README.md — category table + error handling fix
• README.md — agent/skill/plugin counts updated
• 5 docs site pages — plugin count and configuration example updates

Note

.devcontainer/.env.example still has the old OFFICIAL_PLUGINS comment — the protected-files guard blocked the edit (running from cached install). Needs manual update.

Test plan

• Verify .env.example edits are no longer blocked by the guard
• Verify .env, .env.local, .env.production are still blocked
• Verify setup-plugins.sh installs all 4 official plugins on container start
• Verify docs site builds without errors

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/official-plugins-update

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