docs(grpc): record the Playwright result and root-cause both failures

Phase 0's gate doc now carries the full suite picture, not just the rig checks.

Playwright: 170 pass / 2 fail / 1 skip of 173. Both failures were run down to
root cause and both are pre-existing on main, unrelated to this branch (which
touches no EF, CentralUI, Transport or ManagementService file):

- TransportImportTests is a REAL production bug: BundleImporter.cs:1298 opens a
  user-initiated transaction while the central context has EnableRetryOnFailure,
  so SqlServerRetryingExecutionStrategy refuses the split query inside it and
  bundle import fails against real MS SQL. The unit/integration suite cannot see
  it -- the in-memory EF provider has no retrying strategy and BeginTransaction
  is a no-op there.

- SmsNotificationE2ETests is a stale fixture: SID 'ACtest123' (2026-06-19) vs the
  ^AC[0-9a-fA-F]{32}$ guard added 2026-07-10 (40088a21). Failing since then, which
  has also silenced everything after the toast assertion -- including the
  secret-non-leak check on the Auth Token.

Also records that the earlier 44-failure run is void: a concurrent deploy.sh was
recreating the cluster underneath it.

Neither is fixed here; both are out of scope for a PSK-auth branch.

docs/plans/2026-07-22-clusterclient-to-grpc-plan.md.tasks.json

@@ -81,7 +81,7 @@
         "T0.3",
         "T0.4"
       ],
-      "notes": "Live gate PASS 2026-07-22 (docs/plans/2026-07-22-clusterclient-to-grpc-live-gate.md). Suite: 29 non-Playwright suites / 6872 tests / 0 failures; Host.Tests 366. Playwright re-run against the stable rig was still in flight at compaction \u2014 the earlier 44 failures were contaminated by a concurrent rig rebuild and are VOID. REMAINING: confirm Playwright, then PR + merge (held for the user per the plan's stop-at-DoD rule)."
+      "notes": "Live gate PASS 2026-07-22 (all 7 checks, docs/plans/2026-07-22-clusterclient-to-grpc-live-gate.md). Suite: 29 non-Playwright suites / 6872 tests / 0 failures. Playwright 170 pass / 2 fail / 1 skip of 173 - BOTH failures root-caused and PRE-EXISTING on main, unrelated to Phase 0 (branch touches no EF/CentralUI/Transport/ManagementService file): (1) TransportImportTests - REAL production bug, BundleImporter.cs:1298 user-initiated transaction + EnableRetryOnFailure => import broken on real MS SQL, hidden by the in-memory EF provider; (2) SmsNotificationE2ETests - stale fixture SID 'ACtest123' vs the ^AC[0-9a-fA-F]{32}$ guard added 2026-07-10 (40088a21); failing since then, which also silences its secret-non-leak assertion. The earlier 44-failure run is VOID (concurrent rig rebuild). REMAINING: PR + merge, HELD for the user per the plan's stop-at-DoD rule."
     },
     {
       "id": "T1A.1",
@@ -238,4 +238,4 @@
       ]
     }
   ]
-}
+}