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phases/7-mvp-quality-hardening/step2.md

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+# Step 2: regression-thresholds
+
+## Read First
+- /AGENTS.md
+- /PLAN.md
+- /PROGRESS.md
+- /docs/HARNESS.md
+- /docs/IMPLEMENTATION_PLAN.md
+- /docs/PRD.md
+- /phases/7-mvp-quality-hardening/step1.md
+
+## Task
+Define MVP regression thresholds for the sample corpus.
+
+Thresholds should distinguish mandatory fast validation from slower/manual quality checks.
+
+## Sprint Contract
+- Done means: MVP pass/fail criteria are encoded in tests or documented commands and tied to sample metadata traits.
+- Hard thresholds: mandatory validation remains runnable on the local machine; slow tests are opt-in; failed quality areas are not masked.
+- Files owned: `tests/`, `scripts/`, sample metadata updates if needed, `PROGRESS.md`, phase index.
+- Dependencies: Quality metrics report.
+
+## Acceptance Criteria
+```powershell
+python scripts\validate_workspace.py
+.\venv\python.exe -m pytest tests
+```
+
+## Verification
+1. Run the acceptance commands.
+2. Confirm slow tests are documented separately if needed.
+3. Update `PROGRESS.md` and this phase index.
+
+## Do Not
+- Do not make local validation unusably slow.
+- Do not turn all failures into warnings.
+- Do not remove sample coverage for Korean paths or formulas.