Add CLAUDE.md enforcement across the three core agents:
- gsd-plan-checker: new Dimension 10 verifies plans respect project
conventions, forbidden patterns, and required tools from CLAUDE.md
- gsd-phase-researcher: outputs Project Constraints section from
CLAUDE.md so planner can verify compliance
- gsd-executor: treats CLAUDE.md directives as hard constraints,
with precedence over plan instructions
Includes 4 regression tests validating the new dimension and
enforcement directives across all three agents.
Closes#1260
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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