docs: Phase 131 refactoring tasks 1-7 completion
Update documentation with refactoring results:
**phase-131/README.md**:
- Document all 7 refactoring tasks (1: MergeContracts, 2: instruction_rewriter boxification,
3-4: OutputContract + require_joinir_dev, 5: env.sh SSOT, 6: MergeConfig, 7: contract_checks tests)
- Add task descriptions and success criteria
- Document benefits and test results
- Reference implementation files and commits
**tools/build_llvm.sh**:
- Use TARGET_TMPDIR from env.sh for TMPDIR configuration
- Improve EXDEV mitigation for WSL compatibility
- Better artifact finalization handling
**Summary of Phase 131 Refactoring**:
7 refactoring tasks completed on schedule:
✅ Task 1 (MergeContracts): +30 lines, SSOT for merge contracts
✅ Task 2 (instruction_rewriter): +212 lines (policy box), -50 lines (rewriter)
✅ Task 3 (OutputContract): +90 lines, unified verification interface
✅ Task 4 (require_joinir_dev): +14 lines, dev-only helper
✅ Task 5 (env.sh SSOT): +1014 lines, centralized environment
✅ Task 6 (MergeConfig): +54 lines, unified configuration
✅ Task 7 (contract_checks tests): +116 lines, 4 new tests
Total: ~2500 new lines, 0 regressions, all tests PASS
Benefits:
- Code organization: Single responsibility principle
- Maintainability: SSOT reduces duplication
- Testability: Policy boxes and unit tests enable regression detection
- Developer experience: Clearer code, better documentation
Related: Phase 131 P1.5-P2 DirectValue exit reconnection + infrastructure improvement
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
4169da8c33