docs(14-06): Phase 14 validation signed off, requirements complete, API coverage confirmed, folded todos closed

- 14-VALIDATION.md: per-task map 14-01-T1 to 14-06-T4, all green, the
  measured coverage, validated, Nyquist-compliant, Wave 0 complete, the
  final --all and --removal results
- REQUIREMENTS.md: INTG-02 and API-08 Complete (JOBS-02, JOBS-03, SRCH-02,
  INTG-01, CLI-05 already were)
- COVERAGE.md: every INTEGRATE row's test confirmed by --named
- fetchguard-guarded-http-client and redacting-slog-handler moved to done

.planning/phases/14-domain-jobs-and-external-integrations/COVERAGE.md

@@ -3,6 +3,8 @@
 > Full coverage by default. Opt-outs are explicit, reasoned decisions.
 >
 > Scope: Phase 14 is a parity port. The PHP reference (Płytarium's Golem15.Fonoteka, Golem15.Golem and Golem15.Feedback plugins) defines the surface. Every capability the PHP code calls is INTEGRATE. Every capability it never calls is OPT-OUT with the reason "not used by the PHP reference — parity port". The INTEGRATE reason column names the test that proves the capability. Plan 14-06 confirms each named test passes, and `scripts/check-phase14.sh --evidence` refuses a row whose test is missing or failing.
+>
+> Confirmed 2026-10-04 (plan 14-06): every test an INTEGRATE row names is run by exact name by `scripts/check-phase14.sh --named` and passed in that run; `--evidence` refuses an INTEGRATE row naming a test outside that stage and an OPT-OUT row without a reason. Live vendor calls stay out of the gate (D-15): each INTEGRATE capability is proven against PHP's recorded exchange or a scripted vendor answer.
 
 ## Discogs API (api.discogs.com, i.discogs.com)