Adds crewli-architect, backend/frontend-implementer, test-writer subagents,
the /build-module orchestrator command, the PR merge-gate template, and a
permissions allow-list in settings.json. Documents the layer as
CLAUDE_CODE_TOOLING.md section 10. Implementer Edit/Write is allow-listed;
git push deliberately omitted so merge/push stay human.
Co-Authored-By: Claude <noreply@anthropic.com>
Registers PreToolUse, PostToolUse, and SessionStart hooks for the
deterministic guard-rail layer. settings.local.json stays gitignored
for per-user overrides.
