Add a non-blocking, warn-only codebase-drift gate at plan:pre so a stale
STRUCTURE.md is surfaced before /gsd:plan-phase spawns the planner, instead
of being discovered mid-execution by the existing execute:wave:post gate.
Gated on a dedicated workflow.plan_drift_precheck toggle (default true),
independent of schema_drift_gate. Never blocks planning, never spawns the
mapper agent at plan time.
Review feedback (#1595):
- Use a documented conventional-commit type (feat, not enhance) per
CONTRIBUTING.md / gsd-validate-commit.sh.
- Normalize the plan_drift_precheck command references to the colon prose
form (/gsd:plan-phase, /gsd:map-codebase) to match plan-phase.md §5.65;
registry regenerated from capability.json.
- Make the test temp dirs hermetic: drain mkdtemp dirs in an after() hook
via the helpers.cleanup() budget (local/no-raw-rmsync-in-tests-compliant).
Closes#1592
Claude-Session: https://claude.ai/code/session_016JBiXEAofvB3prJim29XMS
d1f7ba82f2