test(core): add tracking-issue ref to M8/M9 allow-test-rule exemptions (#1531)

lint-allow-test-rule-refs (ADR-456) flagged the two architectural-invariant
exemptions as novel offenders lacking a #NNN reference, failing lint-tests. Add
(see #1531) to both annotation lines; lint:ci now green.

Claude-Session: https://claude.ai/code/session_01R88n7Q54bAaVHFkDbbH1yz

tests/m8-writestatemd-scan-after-lock.test.cjs

@@ -1,5 +1,5 @@
 'use strict';
-// allow-test-rule: architectural-invariant
+// allow-test-rule: architectural-invariant (see #1531)
 // writeStateMd's "scan happens INSIDE the lock" property is a concurrency invariant.
 // A single-threaded test cannot observe the difference between scan-before-lock and
 // scan-after-lock unless something mutates the disk in the window between the two.

tests/m9-statelock-write-error-orphan.test.cjs

@@ -1,5 +1,5 @@
 'use strict';
-// allow-test-rule: architectural-invariant
+// allow-test-rule: architectural-invariant (see #1531)
 // acquireStateLock's "no orphan empty lock + no fd leak on a recoverable
 // writeSync/closeSync error" property is a resource-safety invariant of a private
 // function. A single-threaded test cannot otherwise force the openSync-succeeds-