fix: add explicit .md stripping to URL rules, improve cd failure handling

- SKILL.md: URL mapping rules now explicitly mention stripping .md extension
- sync-docs.sh: cd failure now outputs context message instead of silent exit

Author: costiash

plugin/hooks/sync-docs.sh

@@ -43,7 +43,7 @@ if [ ! -d "$DOCS_DIR" ]; then
 fi
 
 # Pull updates (non-blocking, timeout after 10s)
-cd "$DOCS_DIR" || exit 0
+cd "$DOCS_DIR" || { output_context "Claude docs directory missing. Re-run /docs -t to reinstall."; exit 0; }
 BEFORE=$(git rev-parse HEAD 2>/dev/null)
 run_with_timeout 10 git pull --ff-only origin main >/dev/null 2>&1 || true
 AFTER=$(git rev-parse HEAD 2>/dev/null)

plugin/skills/claude-docs/SKILL.md

@@ -79,8 +79,8 @@ Grep: "<keyword>" in ~/.claude-code-docs/docs/
 
 ### Determining Source URLs
 
-- Files starting with `claude-code__` → `https://code.claude.com/docs/en/<page>` (replace `claude-code__` prefix and `__` with `/`)
-- Files starting with `docs__en__` → `https://platform.claude.com/en/docs/<path>` (replace `docs__en__` prefix with `en/docs/` and remaining `__` with `/`)
+- Files starting with `claude-code__` → `https://code.claude.com/docs/en/<page>` (strip `.md` extension, replace `claude-code__` prefix and `__` with `/`)
+- Files starting with `docs__en__` → `https://platform.claude.com/en/docs/<path>` (strip `.md` extension, replace `docs__en__` prefix with `en/docs/` and remaining `__` with `/`)
 
 ## Reference Files