chore(quality): rebaseline imageGeneration.ts for the #12945 image-only-model guard

3259 -> 3293 (+35/-1). Landed separately because #12945's branch has a live
worktree in another session.

changelog.d/maintenance/12945-imagegeneration-rebaseline.md

@@ -0,0 +1 @@
+- **chore(quality):** raise the `imageGeneration.ts` file-size ceiling for the image-only-model guard that clears the #12945 base-red

config/quality/file-size-baseline.json

@@ -1,4 +1,5 @@
 {
+  "_rebaseline_2026_09_11_12945_image_only_model_guard": "PR #12945 own growth: open-sse/handlers/imageGeneration.ts 3259->3293 (+35/-1). The image-only-model guard the PR adds to clear its base-red: the handler now recognises a model that only serves image generation and answers before the chat path can mis-route it. Irreducible at this call site; the predicate itself lives outside the file. Landed as its own PR rather than on #12945 because that branch has a live worktree in another session and pushing to it would pull the branch out from under whoever is working it. Covered by the batch run: 203/208 with the 5 remaining failures reproducing on the pure tip.",
   "_rebaseline_2026_09_11_mergebatch_v3851_diego": "/merge-batch 2026-09-11 (v3.8.51), owner batch. open-sse/handlers/chatCore.ts 6144->6146 (+2): #13278 requires a Responses-shaped body before the native OpenAI-compatible passthrough (+1) and #13276 stops the reactive-compaction log from claiming a compaction when compression is disabled (+2/-1). Both are guard conditions at existing call sites, no new branching structure. open-sse/utils/stream.ts is deliberately NOT rebaselined: already 3115 > 3098 on the pure tip with zero contribution from this batch (base-red #12732, owned by /sweep-reds). Covered by 256 assertions across the batch's test files (246 node:test + 10 vitest).",
   "_rebaseline_2026_09_11_mergebatch_v3851_houminxi": "/merge-batch 2026-09-11 (v3.8.51), batch by HouMinXi. Final combined values, set on the first PR merged so every intermediate state is covered. open-sse/handlers/chatCore.ts 6036->6144: #13069 routes the non-streaming leg through the same provider-failure classification, model lockout and credential-refresh path the streaming leg already used (+443/-340 = +103 net; it extracts applyProviderFailureClassification and wires both legs to it, which is what #13043 reported missing), plus #13050 stamping that the client asked for SSE before the web_search fallback flips stream off (+6) and #13038 threading the dispatched target index (+3). src/sse/services/auth.ts 3488->3542: #13017 adds the explicit-pin one-shot probe for a recoverable inactive row with its 60s storm gate (+42 net) and #13061 makes a grok-cli 402 a connection-wide shared-wallet signal instead of a per-model billing miss (+12 net). src/sse/handlers/chat.ts 2458->2462: #13038 (+5). open-sse/services/combo/executeTargetAttempt.ts 1205->1212: #13006 feeds the 402 it already classified into the quota cache instead of dropping it (+7). open-sse/services/accountFallback.ts 2468->2469: #13060 adds the Cline re-auth phrase to OAUTH_INVALID_TOKEN_SIGNALS (+1). open-sse/utils/stream.ts is deliberately NOT rebaselined: already 3115 > 3098 on the pure tip with zero contribution from this batch (base-red #12732, owned by /sweep-reds). The file also carried \"open-sse/handlers/chatCore.ts\" twice (6026 and 6036); JSON keeps the last, so the first was dead weight any writer could have picked instead. Collapsed to one entry at the live value. Covered by 531 focused assertions across the batch's 46 test files.",
   "_rebaseline_2026_09_11_12358_chat_pipeline_custom_node": "PR #12358 own test growth: tests/integration/chat-pipeline.test.ts 1648->1736 (+88). One new integration case, \"#11884 chat pipeline sends a custom node's edited Chat API type upstream\": it seeds a custom OpenAI-compatible node with an edited Chat/Responses API type, stubs fetch, drives handleChatCore and asserts the upstream request carries the live connection setting rather than the format baked into the node id at creation. Irreducible at this layer — the point of the test is the full route-to-upstream path, which is what #11884 regressed. Nothing else in the file changed. Covered by the case itself plus tests/unit/chat-helpers.test.ts (28/28).",
@@ -433,7 +434,7 @@
     "open-sse/executors/cursor.ts": 1759,
     "open-sse/executors/muse-spark-web.ts": 1405,
     "open-sse/handlers/chatCore.ts": 6146,
-    "open-sse/handlers/imageGeneration.ts": 3259,
+    "open-sse/handlers/imageGeneration.ts": 3293,
     "open-sse/handlers/search.ts": 1789,
     "open-sse/mcp-server/schemas/tools.ts": 1621,
     "open-sse/mcp-server/server.ts": 1572,