refactor(agents): inject CONTRACT MANDATE into all coder agent prompts
Why: agents kept forgetting #region contracts because the rationale
was hidden in loadable skills, not active in their system prompt.
Changed agent prompts (+RATIONALE-first):
- python-coder: +55 lines — 4 failure modes + operational rules
- fullstack-coder: +40 lines — same, with cross-stack emphasis
- svelte-coder: replaced PHYSICS OF ATTENTION with unified mandate
- qa-tester: +15 lines — QA-specific contract mandate
Compressed skills (reference-only):
- semantics-core: 174→110 lines (-37%) — rationale removed, syntax+tables kept
- semantics-contracts: 103→79 lines (-23%) — duplicates removed, methodology kept
Verification: 320 tests pass, 0 parse warnings, 0 semantic audit warnings
busya
07cfaadee1