feat: ClaudeForge 2.1.0 — installable plugin with 150-line cap, forked audit skills, /sync --weekly, and AGENTS.md export (#26)

skill/claude-md-drift-audit/SKILL.md

@@ -0,0 +1,51 @@
+---
+name: claude-md-drift-audit
+description: Audit every CLAUDE.md in this project for drift against the last week of git history. Flags sections that reference deleted files, renamed paths, or removed dependencies. Read-only — returns a punch list, never edits.
+when_to_use: |
+  Use when the user asks "is my CLAUDE.md still accurate?", "audit my docs for staleness",
+  "what changed in the last week?", or as part of /sync-claude-md --weekly.
+argument-hint: "[days=7]"
+context: fork
+agent: Explore
+allowed-tools:
+  - Read
+  - Glob
+  - Grep
+  - "Bash(git log:*)"
+  - "Bash(git diff:*)"
+  - "Bash(git status:*)"
+  - "Bash(find:*)"
+disable-model-invocation: false
+---
+
+# CLAUDE.md Drift Audit (forked, read-only)
+
+Days window: `$ARGUMENTS` (default `7` if empty).
+
+Perform these steps in order, then return a single punch-list summary. Do not modify any file.
+
+1. **Inventory** every `CLAUDE.md` and `*.claude/rules/*.md` in the tree using `find . -name "CLAUDE.md" -type f -not -path "*/.git/*" -not -path "*/node_modules/*"`. List paths and line counts.
+2. **Collect change signal** for the window:
+   - `git log --since="$ARGUMENTS days ago" --name-status --no-merges --diff-filter=DR` → deleted and renamed paths.
+   - `git diff "@{$ARGUMENTS days ago}" --name-status -- package.json requirements.txt pyproject.toml go.mod Cargo.toml 2>/dev/null` → manifest deltas (removed/added deps).
+3. **Cross-reference** each CLAUDE.md against those signals using `grep` / `Read`:
+   - Mark any line that names a deleted or renamed path.
+   - Mark any line in a Tech Stack / Dependencies section that names a removed dep.
+   - Mark any `@path/...` chain import or markdown link whose target was deleted.
+4. **Return** the punch list in this exact shape (markdown), nothing else:
+
+```
+## Drift Audit (window: <N> days)
+
+Total CLAUDE.md inspected: <count>
+Signals examined: <deleted_paths>, <renamed_paths>, <removed_deps>
+
+### Findings
+- <path>:<line> — <one-sentence reason> — suggested action
+- ... (one bullet per drift; omit section if empty)
+
+### Clean
+- <path> (lines unchanged, references valid)
+```
+
+5. If no drift is found, return exactly `## Drift Audit\n\nNo drift in <N>-day window. <count> files inspected.`. Do not pad the output.