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0a9df1e10d
Closes #10183, Closes #10268 3.8.49 (#9654/#9940) replaced the 3.8.48 heap-ratio shed (heapUsed/heapLimit >= 0.75) in chatBodyAdmission.ts with an unconditional CHAT_MAX_HEAVY_IN_FLIGHT=1 structural lease. A second concurrent "structurally heavy" chat request (>=200 messages, >=64 tools, or >=32k estimated tokens — routine for coding-agent fan-out like Hermes/Cursor/Claude Code) was hard-rejected with a retryable HTTP 503 chat_admission_busy/structure_limit regardless of actual heap pressure, even on a host with ample free RAM. Restore the heap-conditional gate as an ADDITIONAL check layered on top of (not a replacement for) the #9654 bounded-concurrency / per-connection-lane protection: when heavyweight capacity is busy, only enter the bounded-wait/shed path when a live heap-pressure probe (heapUsed / v8 heap_size_limit >= OMNIROUTE_CHAT_ADMISSION_HEAP_SHED_RATIO, default 0.75) confirms real pressure. A healthy heap now admits the second heavy request immediately via a no-op lease instead of parking or shedding it. The probe is injectable via admitChatStructure({ heapPressureCheck }) for deterministic tests. Regression tests: - tests/unit/bug-10183-admission-heavy-healthy-heap.test.ts (new, permanent): healthy-heap 2nd heavy request now admitted (was RED); genuinely pressured heap still sheds it. - tests/unit/probe-10268-structural-503.test.ts (promoted to permanent): the exact reported 503 chat_admission_busy shape is still produced under real heap pressure, and the same fan-out is admitted on a healthy heap. - tests/unit/chat-body-admission.test.ts, tests/unit/chat-body-admission-queue.test.ts, tests/unit/per-connection-admission-9654.test.ts updated to inject heapPressureCheck: () => true where they exercise the busy/shed path, preserving #9654/#4380 coverage. Gates run: npm run typecheck:core (clean), eslint --suppressions-location config/quality/eslint-suppressions.json on changed files (clean), scripts/check/check-file-size.mjs (OK), scripts/check/check-test-discovery.mjs (OK), focused admission suite (68/68 passing) and npm run test:unit (in progress at commit time under heavy shared-devbox contention from a 13-way parallel session fan-out; no admission-related failures observed through 1873 lines of output, the sole failure seen was a pre-existing unrelated proxy/search timeout consistent with known load-induced flakiness, not a regression from this change). ⚠️ base-red inherited: #9985 — ESLint errors (2) from #10250