chore(gates): ratchet DOWN the objectql-double-limit entry for the deleted parity test

`account-issuer-parity.test.ts` retired with `sys_account.issuer`, so its
grandfathered `blind: 1` entry now names a file that is gone and
`check:objectql-double-limit` refuses it by name:

  packages/plugins/plugin-auth/src/account-issuer-parity.test.ts: baselined
  file is clean or gone -- ratchet DOWN: delete its entry.

Deleting the entry is the only legitimate direction here: it shrinks the
grandfathered set by one. Nothing is added and nothing is loosened; the gate
re-reports 251 grandfathered files where it read 252, "none new", and the
baseline key set still verifies against the merge base.

⭐ Found by running the whole `Lint & Repo Gates` step sequence locally rather
than the one gate CI named. The lint job fail-fasts, so each CI round has
revealed exactly one stale ledger and hidden the rest -- this is the third such
notch on this branch (tenant-audit census, then vendor version stamps, now this
ratchet). All 162 `run:` steps of the job were executed in workflow order,
continuing past every failure. This was the only gate failing for a reason this
PR owns.

The five remaining red steps are host artifacts, not diff artifacts: the only
bash on this machine is 3.2.57, and each of the five needs a bash >= 4 builtin
or a shell that can simulate 3.2 by removing one. Proven by running the same
five blocks, extracted from main's own lint.yml, in a detached worktree at an
unmodified origin/main (3ef96b4) -- same exit codes, byte-identical failing
assertions. This PR changes no `.sh` file, no workflow and no hook, and the
bash-3.2 gate's real-tree scan -- the half a diff could move -- is green with
0 findings on both trees.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Author: hotlong

scripts/objectql-double-limit.baseline.json

@@ -528,9 +528,6 @@
     "packages/plugins/plugin-auth/src/accept-invitation-adopt-membership.test.ts": {
       "wrong": 1
     },
-    "packages/plugins/plugin-auth/src/account-issuer-parity.test.ts": {
-      "blind": 1
-    },
     "packages/plugins/plugin-auth/src/admin-revoke-user-session-match-guard.test.ts": {
       "wrong": 1
     },