Implements the process layer of the v1 feature-lock planner: capability
proposals arrive uniform via issue form; the lock artifact
(docs/architecture/v1-scope.md) is CODEOWNERS-gated; the shared
CLAUDE.md/AGENTS.md guidelines gain the scope gate, additive-only API
rules, and pre-push checklist for agent-driven contributions.
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
