docs(20-01): append self-check result to plan summary

.planning/phases/20-remediation-approval-audit-safety/20-01-SUMMARY.md

@@ -102,6 +102,10 @@ None - no external service configuration required. No package installs.
 - Plan 02 (routes) can now import `approveRemediationActions`, `remediateApprovedActions`, `markCampaignFalsePositive`, and their typed error classes to wire `/api/phishing/campaigns/[id]/{approve,remediate,mark-false-positive}` routes, mapping `RemediationValidationError` → 400 and `RemediationConflictError` → 409 (or equivalent per Plan 02's own design).
 - No blockers. `npx vitest run lib/services/phishing-audit.test.ts lib/services/remediation-service.test.ts` (11 tests) and `npx tsc --noEmit --pretty` are both clean at HEAD.
 
+## Self-Check: PASSED
+
+All created files and commit hashes verified present on disk / in git log.
+
 ---
 *Phase: 20-remediation-approval-audit-safety*
 *Completed: 2026-07-16*