strict-validation-setup

The skill ships two distinct concerns split by temporal phase:

• Project-stable — strict-mode tooling config + AGENTS.md authoring (defer the AGENTS.md content to init; this skill only ensures it exists and references the per-task pattern).
• Task-ephemeral — .agent-tasks/<task-id>/GOALS.md per task plus failing-test scaffolding co-located with it.

These never mix. Task goals never go into AGENTS.md (would leak as project policy). Project invariants never go into per-task GOALS.md (would duplicate per task and drift).

Modality differentiation