chore: Add hooks directory and update CLAUDE.md navigation

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.claude/hooks/CLAUDE.md

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+# hooks/
+
+## Files
+
+| File | What | When to read |
+| ---- | ---- | ------------ |
+| `enforce-agent-model.sh` | Enforces correct model for Task tool calls | Debugging agent model issues |
+
+## enforce-agent-model.sh
+
+PreToolUse hook that ensures Task tool calls use the correct model based on `subagent_type`.
+
+### Agent Model Mapping
+
+| Agent | Required Model |
+|-------|----------------|
+| feature-agent | sonnet |
+| first-frontend-agent | sonnet |
+| platform-agent | sonnet |
+| quality-agent | sonnet |
+| developer | sonnet |
+| technical-writer | sonnet |
+| debugger | sonnet |
+| quality-reviewer | opus |
+| Explore | sonnet |
+| Plan | sonnet |
+| Bash | sonnet |
+| general-purpose | sonnet |
+
+### Behavior
+
+- Blocks Task calls where `model` parameter doesn't match expected value
+- Returns error message instructing Claude to retry with correct model
+- Unknown agent types are allowed through (no enforcement)
+
+### Adding New Agents
+
+Edit the `get_expected_model()` function in `enforce-agent-model.sh` to add new agent mappings.