diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 3dbd13607..2b3f0673c 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -41,5 +41,10 @@ jobs:
         run: npm test
 
       - name: Run tests with coverage
-        if: github.event_name == 'pull_request'
+        # c8 v11 requires Node 20+ (engines: ^20.0.0 || >=22.0.0). Node 18 EOL April 2025.
+        if: github.event_name == 'pull_request' && matrix.node-version != 18
         run: npm run test:coverage
+
+      - name: Run tests (Node 18, coverage not supported)
+        if: github.event_name == 'pull_request' && matrix.node-version == 18
+        run: npm test
diff --git a/.planning/phases/13-verification-milestone-cleanup/13-03-SUMMARY.md b/.planning/phases/13-verification-milestone-cleanup/13-03-SUMMARY.md
new file mode 100644
index 000000000..eca790904
--- /dev/null
+++ b/.planning/phases/13-verification-milestone-cleanup/13-03-SUMMARY.md
@@ -0,0 +1,37 @@
+---
+phase: 13-verification-milestone-cleanup
+plan: "03"
+subsystem: documentation
+tags: [verification, coverage, cov-tooling, retroactive]
+requirements-completed: [COV-01, COV-02, COV-03]
+duration: 2min
+completed: 2026-02-25
+---
+
+# Phase 13 Plan 03: Create 12-VERIFICATION.md Summary
+
+**12-VERIFICATION.md created for Phase 12, retroactively confirming COV-01, COV-02, COV-03 with live test run evidence**
+
+## Performance
+
+- **Duration:** 2 min
+- **Completed:** 2026-02-25
+- **Tasks:** 2
+- **Files modified:** 1
+
+## Accomplishments
+
+- Ran `npm run test:coverage` (433 pass, 0 fail; all 11 modules above 70%) to capture live evidence
+- Confirmed CI workflow has `Run tests with coverage` step with `if: github.event_name == 'pull_request'`
+- Created 12-VERIFICATION.md at .planning/phases/12-coverage-tooling/12-VERIFICATION.md
+- All 3 COV requirements (COV-01–03) confirmed PASS with specific evidence
+- Phase 12 Goal verified: c8 integrated, 70% threshold enforced, CI workflow operational
+
+## Files Created/Modified
+
+- `.planning/phases/12-coverage-tooling/12-VERIFICATION.md` — Phase 12 verification (72 lines)
+
+## Self-Check: PASSED
+
+- 12-VERIFICATION.md: created, verified COV-01–03 references present (grep count: 5)
+- Commit: bd9bdad (docs)
diff --git a/package.json b/package.json
index 3706cc2bc..a23f9f450 100644
--- a/package.json
+++ b/package.json
@@ -46,6 +46,6 @@
     "build:hooks": "node scripts/build-hooks.js",
     "prepublishOnly": "npm run build:hooks",
     "test": "node --test tests/*.test.cjs",
-    "test:coverage": "c8 --check-coverage --lines 70 --reporter text --include 'get-shit-done/bin/lib/*.cjs' --exclude 'get-shit-done/bin/gsd-tools.cjs' --exclude 'tests/**' --all node --test tests/*.test.cjs"
+    "test:coverage": "c8 --check-coverage --lines 70 --reporter text --include 'get-shit-done/bin/lib/*.cjs' --exclude 'tests/**' --all node --test tests/*.test.cjs"
   }
 }