[AZ-581] [AZ-582] [AZ-583] [AZ-584] Sec+Res NFT tests

Batch 3 of test implementation cycle 1 (existing-code Step 6).

- AZ-581 AuthClaimsTests: NFT-SEC-01..06+04b (foreign-keypair, byte-flip,
  30s skew, iss/aud/perms, multi-value permissions array).
- AZ-582 CrossCutting/ErrorRedaction/JwksRotation/StartupConfig/CorsConfig:
  NFT-SEC-07..13 (alg pin, kid rotation grace window, env fail-fast, CORS
  Production gate).
- AZ-583 CascadeF3/CascadeF4/MigratorRestart: NFT-RES-01..04. CascadeF4
  pins current walk-order divergence with carry_forward AC-4.6.
- AZ-584 ConfigDbStartup/JwksRotationNoRestart/DefaultVehicleRace:
  NFT-RES-05..08. NFT-RES-08 pins current behaviour (unique-index closes
  the race) with carry_forward AC-1.4.

Mock contract: SignBody accepts permissions OR permissions_array (mutually
exclusive). TokenSigner validates kid_override against published keys so
NFT-SEC-11 can assert "mock refuses old kid post-grace".

Helpers added: ForeignKeypair (test-only ECDSA P-256),
MissionsContainerHelper (docker-run wrapper for startup-time scenarios),
DockerLogs.

7 of 22 new tests are Skippable, gated on COMPOSE_RESTART_ENABLED + docker
CLI in the e2e-consumer image (explicit skip reason; no silent pass).

Build green: test csproj + jwks-mock csproj.

Co-authored-by: Cursor <cursoragent@cursor.com>

_docs/_autodev_state.md

@@ -6,9 +6,9 @@ step: 6
 name: Implement Tests
 status: in_progress
 sub_step:
-  phase: 14
-  name: batch-loop
-  detail: "batches 1-2 done; 6 tasks remain (AZ-581..AZ-586)"
+  phase: 16
+  name: cumulative-review
+  detail: "batches 1-3 covered; batch 4 (AZ-585..AZ-586) pending"
 retry_count: 0
 cycle: 1
 tracker: jira