chore(ci): reconcile api-validation baselines after the staging merge

The staging merge unioned realtime-rooms's own `as unknown as` cast
(lib/collab-doc/converter.ts) with staging's zod-recursive-type cast
(lib/api/contracts/tables.ts), so the non-test double-cast count is 9 —
both casts pre-existed and were individually accepted on their branches.
Also tighten rawJsonReads 6->5 to the true current count. Fixes the strict
API contract boundary audit on realtime-rooms.

Author: waleedlatif1

scripts/check-api-validation-contracts.ts

@@ -24,8 +24,8 @@ const BOUNDARY_POLICY_BASELINE = {
   clientHookLocalSchemaConstructors: 0,
   clientHookRawFetches: 0,
   clientSameOriginApiFetches: 0,
-  doubleCasts: 8,
-  rawJsonReads: 6,
+  doubleCasts: 9,
+  rawJsonReads: 5,
   untypedResponses: 0,
   annotationsMissingReason: 0,
 } as const