feat(hooks): add stop hook demo and examples documentation

- Add hook_demo.js demonstrating the COMPLETE comment pattern
- Add stop-hooks-examples.md with real-world hook patterns for
  TypeScript, linting, tests, builds, and chaining multiple checks

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

advanced-claude-workflows/hook_demo.js

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+console.log('Hello World');
+// COMPLETE

advanced-claude-workflows/stop-hooks-examples.md

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+# Stop Hook Examples
+
+## How It Works
+
+Every time Claude finishes a response, the hook runs. If it outputs JSON with `"decision": "block"`, Claude sees the reason and keeps working until the check passes.
+
+```
+Claude finishes → hook runs → check fails → Claude fixes → tries again
+                                          → check passes → Claude stops
+```
+
+## Pattern
+
+```bash
+<your-check-command> 2>&1 || echo '{"decision":"block","reason":"<what went wrong>"}'
+```
+
+- Check passes → output nothing → Claude stops
+- Check fails → output JSON → Claude fixes and retries
+
+## Common Examples
+
+```bash
+# TypeScript type checking
+npx tsc --noEmit 2>&1 || echo '{"decision":"block","reason":"TypeScript errors found"}'
+
+# Linting
+npm run lint 2>&1 || echo '{"decision":"block","reason":"Linting errors found"}'
+
+# Tests
+npm test 2>&1 || echo '{"decision":"block","reason":"Tests failing"}'
+
+# Build
+npm run build 2>&1 || echo '{"decision":"block","reason":"Build failed"}'
+```
+
+## Chaining Multiple Checks
+
+```bash
+npm run typecheck 2>&1 || echo '{"decision":"block","reason":"Typecheck failed"}' && \
+npm run lint 2>&1 || echo '{"decision":"block","reason":"Lint failed"}' && \
+npm test 2>&1 || echo '{"decision":"block","reason":"Tests failing"}'
+```
+
+## Configuration
+
+Add hooks to `.claude/settings.local.json` in your project:
+
+```json
+{
+  "hooks": {
+    "Stop": [
+      {
+        "hooks": [
+          {
+            "type": "command",
+            "command": "cd \"$CLAUDE_PROJECT_DIR\" && npm run typecheck 2>&1 || echo '{\"decision\":\"block\",\"reason\":\"TypeScript errors found\"}'"
+          }
+        ]
+      }
+    ]
+  }
+}
+```