diff --git a/changelog.d/maintenance/train1h-ratchet-and-stryker.md b/changelog.d/maintenance/train1h-ratchet-and-stryker.md
new file mode 100644
index 0000000000..9dd8a82d0c
--- /dev/null
+++ b/changelog.d/maintenance/train1h-ratchet-and-stryker.md
@@ -0,0 +1 @@
+- chore(quality): re-pin the file-size ceilings touched by the v3.8.49 merge-train 1H (31 PRs) and register three covering tests that had drifted out of `stryker.conf.json` — the mutation gate was failing `Fast Quality Gates` on every new PR
diff --git a/config/quality/file-size-baseline.json b/config/quality/file-size-baseline.json
index 5faef8c12e..bbae0c1ffe 100644
--- a/config/quality/file-size-baseline.json
+++ b/config/quality/file-size-baseline.json
@@ -224,20 +224,20 @@
     "open-sse/executors/deepseek-web.ts": 1148,
     "open-sse/executors/grok-web.ts": 1044,
     "open-sse/executors/muse-spark-web.ts": 1405,
-    "open-sse/handlers/chatCore.ts": 4939,
-    "open-sse/handlers/imageGeneration.ts": 3100,
+    "open-sse/handlers/chatCore.ts": 4955,
+    "open-sse/handlers/imageGeneration.ts": 3101,
     "open-sse/handlers/responseSanitizer.ts": 1115,
     "open-sse/handlers/search.ts": 1536,
-    "open-sse/handlers/videoGeneration.ts": 1038,
+    "open-sse/handlers/videoGeneration.ts": 1063,
     "open-sse/mcp-server/schemas/tools.ts": 1505,
     "open-sse/mcp-server/server.ts": 1407,
     "open-sse/mcp-server/tools/advancedTools.ts": 1120,
-    "open-sse/services/accountFallback.ts": 1965,
+    "open-sse/services/accountFallback.ts": 1966,
     "open-sse/services/adobeFireflyClient.ts": 2317,
     "open-sse/services/claudeCodeCompatible.ts": 1202,
     "open-sse/services/combo.ts": 3648,
     "open-sse/services/compression/strategySelector.ts": 1060,
-    "open-sse/services/rateLimitManager.ts": 1014,
+    "open-sse/services/rateLimitManager.ts": 1060,
     "open-sse/translator/response/openai-responses.ts": 1174,
     "open-sse/utils/cursorAgentProtobuf.ts": 1505,
     "open-sse/utils/stream.ts": 2887,
@@ -270,13 +270,13 @@
     "src/lib/db/providers.ts": 1034,
     "src/lib/memory/retrieval.ts": 1073,
     "src/lib/tailscaleTunnel.ts": 1202,
-    "src/lib/usage/providerLimits.ts": 1006,
+    "src/lib/usage/providerLimits.ts": 1013,
     "src/shared/components/OAuthModal.tsx": 1134,
     "src/shared/components/RequestLoggerV2.tsx": 1629,
     "src/shared/components/analytics/charts.tsx": 1035,
     "src/shared/services/cliRuntime.ts": 1122,
-    "src/sse/handlers/chat.ts": 1842,
-    "src/sse/services/auth.ts": 2492,
+    "src/sse/handlers/chat.ts": 1845,
+    "src/sse/services/auth.ts": 2508,
     "tests/unit/account-fallback-service.test.ts": 1572,
     "tests/unit/provider-validation-specialty.test.ts": 2980
   },
@@ -308,7 +308,7 @@
     "tests/unit/grok-web.test.ts": 2437,
     "tests/unit/image-generation-handler.test.ts": 2029,
     "tests/unit/model-sync-route.test.ts": 1016,
-    "tests/unit/models-catalog-route.test.ts": 1608,
+    "tests/unit/models-catalog-route.test.ts": 1636,
     "tests/unit/perplexity-web.test.ts": 1355,
     "tests/unit/provider-models-route.test.ts": 1784,
     "tests/unit/provider-validation-specialty.test.ts": 2980,
@@ -401,5 +401,6 @@
   "_rebaseline_2026_07_25_v3849_basered_filesize": "Base-red unblock (2026-07-25): check:file-size was failing on release/v3.8.49 at its own HEAD (36f8fd10), so the quality.yml fast-gates job was red for EVERY PR->release regardless of content — growth inherited from already-merged PRs, with no offending PR branch left to fix (same situation as _rebaseline_2026_07_02_5798_release_green). Prod frozen raised to the current base values: src/lib/tokenHealthCheck.ts 832->841, src/sse/handlers/chat.ts 1865->1866, src/sse/services/auth.ts 2475->2486, open-sse/services/accountFallback.ts 1941->1966, open-sse/services/combo.ts 3630->3642. accountFallback.ts was first frozen here at 1960 (the base value at 36f8fd10) and re-measured to 1966 at base tip 1cafd328c a few hours later — the same inherited drift this entry exists for, since check:file-size does not run on the PR->release fast path and so accrues unmeasured between release rebaselines. These files remain frozen and cannot grow further; any in-flight PR that adds lines to them (e.g. #8482 touches accountFallback.ts and combo.ts) bumps its own entry as usual. The release captain rebaseline-at-release supersedes this note.",
   "_rebaseline_2026_07_25_v3849_basered_filesize_2": "Base-red unblock (2026-07-25, second pass): after _rebaseline_2026_07_25_v3849_basered_filesize (measured at 36f8fd10) two more already-merged PRs grew frozen files on release/v3.8.49, so check:file-size — and with it the whole Fast Quality Gates job — is red for EVERY PR->release again, with no offending PR branch left to fix. src/lib/tokenHealthCheck.ts 841->843 (#8426 4528fc455, excludes local CLI providers from expiration) and src/app/(dashboard)/dashboard/providers/page.tsx 1927->1990 (#8349 58ab8b1d2, scroll-position restore on provider-card back-navigation). Trust-but-verify: both values measured on the pristine release tip 30709255 with no working-tree changes. Same situation and remedy as _rebaseline_2026_07_02_5798_release_green. Structural reduction of providers/page.tsx stays tracked separately — it is a 1990-line page, not something to extract inside a base-repair PR.",
   "_rebaseline_2026_07_27_3850_relax_filesize_cap_v2_20pct": "OWNER-APPROVED TEMPORARY relax for v3.8.50-3.8.54 PREPARE phase (docs/ROADMAP.md). v1 was cap 800->900 / testCap 800->900 on 2026-07-27; v2 = v1 +20% buffer = cap 900->1000 (+100), testCap 900->1000 (+100). Justification: same as complexity v2 — the v3.8.50 release cut coincides with high-merge activity; owner accepted enlarging the headroom to cover the entire PREPARE phase (5 minor cycles .50-.54) without per-PR rebaseline noise. Targets: decompose-existing-frozen unchanged (frozen still only-shrink — see frozen[] entries and the 105 files >900 that still need structural decomposition regardless of cap); this only relaxes the cap for NEW files in the decompose/extract-while-PREPARE phase (.51='executor registry in-place' and .52='combo.ts decomposition' create new leaf modules above 800). RE-TIGHTENING MANDATORY in v3.8.51: cap target 850 = 850 once decomposition wave stabilizes (gives 150 units of post-tighten headroom vs the new 1000 ceiling). Tracked via same roadmap issue as complexity v2. Window: v3.8.50 (release cut) → v3.8.54 close (RE-TIGHTEN at v3.8.51 prep merge per ROADMAP.md). Last entry unless measured regression. v1 entry retained below for audit trail.",
-  "_rebaseline_2026_07_27_3850_relax_filesize_cap": "OWNER-APPROVED TEMPORARY relax for v3.8.50-3.8.54 PREPARE phase (docs/ROADMAP.md). cap 800->900 (+100), testCap 800->900 (+100). Targets: decompose-existing-frozen unchanged (frozen still only-shrink); this only relaxes the cap for NEW files in the decompose/extract-while-PREPARE phase (.51='executor registry in-place' and .52='combo.ts decomposition' create new leaf modules above 800). RE-TIGHTENING MANDATORY in v3.8.51: cap target 850 = 850 once decomposition wave stabilizes. SUPERSEDED by _rebaseline_2026_07_27_3850_relax_filesize_cap_v2_20pct (v1 +20% buffer) — retained for audit. Tracked via same roadmap issue."
+  "_rebaseline_2026_07_27_3850_relax_filesize_cap": "OWNER-APPROVED TEMPORARY relax for v3.8.50-3.8.54 PREPARE phase (docs/ROADMAP.md). cap 800->900 (+100), testCap 800->900 (+100). Targets: decompose-existing-frozen unchanged (frozen still only-shrink); this only relaxes the cap for NEW files in the decompose/extract-while-PREPARE phase (.51='executor registry in-place' and .52='combo.ts decomposition' create new leaf modules above 800). RE-TIGHTENING MANDATORY in v3.8.51: cap target 850 = 850 once decomposition wave stabilizes. SUPERSEDED by _rebaseline_2026_07_27_3850_relax_filesize_cap_v2_20pct (v1 +20% buffer) — retained for audit. Tracked via same roadmap issue.",
+  "_rebaseline_2026_07_27_v3849_train1h": "Merge-train 1H (31 PRs) — owner-approved 2026-07-27. Two distinct causes, kept separate on purpose: (1) GENUINE irreducible growth at existing chokepoints — providerLimits/auth (#8632 Kimi quota-reset recovery), rateLimitManager (#8616 idle wedged limiters), models-catalog-route.test (#8610 OpenCode Go effort aliases); (2) COLLISION with #8585, which banked shrinks measured on the pre-train release tip while 30 sibling PRs in the SAME train grew those files again — chat/accountFallback (#8628), chatCore (#8613), videoGeneration (#8581), imageGeneration. The zero-headroom frozen entries cannot absorb either. Ceilings re-pinned to the post-merge tip; #8612 (also in this train) automates shrink-banking so this self-inflicted drift stops recurring. Detail: src/lib/usage/providerLimits.ts 1006->1013 (#8632); src/sse/services/auth.ts 2492->2508 (#8632); open-sse/services/rateLimitManager.ts 1014->1060 (#8616); src/sse/handlers/chat.ts 1842->1845 (#8628); open-sse/handlers/chatCore.ts 4939->4955 (#8613); open-sse/handlers/imageGeneration.ts 3100->3101 ((sem PR — teto do #8585)); open-sse/handlers/videoGeneration.ts 1038->1063 (#8581); open-sse/services/accountFallback.ts 1965->1966 (#8628); tests/unit/models-catalog-route.test.ts 1608->1636 (#8610)"
 }
diff --git a/stryker.conf.json b/stryker.conf.json
index fa7ba750bd..2e1eb79e04 100644
--- a/stryker.conf.json
+++ b/stryker.conf.json
@@ -39,7 +39,9 @@
   "incremental": true,
   "incrementalFile": "reports/mutation/stryker-incremental.json",
   "testRunner": "tap",
-  "plugins": ["@stryker-mutator/tap-runner"],
+  "plugins": [
+    "@stryker-mutator/tap-runner"
+  ],
   "tap": {
     "testFiles": [
       "tests/unit/7993-noauth-proxy-routing.test.ts",
@@ -205,10 +207,12 @@
       "tests/unit/headroom-codex-quota-snapshot-6379.test.ts",
       "tests/unit/headroom-proxy-lifecycle.test.ts",
       "tests/unit/idempotency-fusion-collision.test.ts",
+      "tests/unit/isLocalStreamLifecycleError-abort-shape.test.ts",
       "tests/unit/issue-6343-v0-web-alias-collision.test.ts",
       "tests/unit/issue-6638-ollama-quota.test.ts",
       "tests/unit/issue-6686-quota-preflight-coverage.test.ts",
       "tests/unit/issue-7071-ollama-session-quota.test.ts",
+      "tests/unit/kimi-quota-reset-recovery.test.ts",
       "tests/unit/livews-forward-backoff-4604.test.ts",
       "tests/unit/management-auth-hardening.test.ts",
       "tests/unit/mark-account-unavailable-numeric-epoch-guard.test.ts",
@@ -225,6 +229,7 @@
       "tests/unit/model-lockout-exact-cooldown-cap.test.ts",
       "tests/unit/model-lockout-max-cooldown.test.ts",
       "tests/unit/no-memory-header.test.ts",
+      "tests/unit/noauth-autocombo-lockout-7623.test.ts",
       "tests/unit/non-streaming-sse-terminal-typescan-4459.test.ts",
       "tests/unit/nvidia-passthrough-models-6773.test.ts",
       "tests/unit/nvidia-quota-phase1.test.ts",
@@ -408,7 +413,11 @@
     ".worktrees",
     ".stryker-tmp"
   ],
-  "reporters": ["progress", "html", "json"],
+  "reporters": [
+    "progress",
+    "html",
+    "json"
+  ],
   "htmlReporter": {
     "fileName": "reports/mutation/mutation.html"
   },