Add regression_gate step between executor completion and verification
in execute-phase workflow. Runs prior phases' test suites to catch
cross-phase regressions before they compound.
- Discovers prior VERIFICATION.md files and extracts test file paths
- Detects project test runner (jest/vitest/cargo/pytest)
- Reports pass/fail with options to fix, continue, or abort
- Skips silently for first phase or when no prior tests exist
Changes:
- execute-phase.md: New regression_gate step
- CHANGELOG.md: Document regression gate feature
- docs/FEATURES.md: Add REQ-EXEC-09
Fixes#945
Co-authored-by: TÂCHES <afromanguy@me.com>
a75c1d1f67