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* fix(chat): reject null/non-object entries in messages[] (#12643) A messages array containing null (or any non-object entry, e.g. [null] or [42]) passed every existing entry guard in chat.ts (#5110/#6402/#6407/#6412) and reached downstream translators/session helpers that read `.role` / `.content` directly off each entry (openai-to-claude.ts, sessionManager.ts, contextManager.ts's fixToolPairs), crashing with a raw TypeError and surfacing as an HTTP 500 instead of a clean 400. The route's Zod schema is intentionally wide (z.array(z.unknown())), so this shape check belongs in the handler's guard chain. Adds one more entry-shape guard clause to the same chokepoint, rejecting the request with a clear 400 before any routing or upstream call. Regression test: tests/unit/chat-messages-entry-objects-12643.test.ts PR #12644 (@soroush5) proposed this exact fix but was closed without merging on 2026-09-12; this re-implements it fresh against the current tip using the same guard shape and error message. Originally-proposed-by: @soroush5 in #12644 Co-authored-by: soroush5 <mrsoroushahmadi@gmail.com> * chore(quality): refix the chat.ts ceiling for the merged tree This branch rebaselined src/sse/handlers/chat.ts against an older tip. After merging the current release tip the combined file is 2520 lines, so the 2500 ceiling no longer covers it. The tip alone is already at 2509 — above the 2500 this PR had frozen — so most of the gap is inherited, not introduced here. This PR's own contribution is the +10 of the messages-entry guard itself. Ceiling refixed at the value the gate reports for the merged tree. --------- Co-authored-by: soroush5 <mrsoroushahmadi@gmail.com>