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* fix(chat-body-admission): process-wide budget (#10110) Remove per-session admission lanes that multiplied the documented "in one process" heavy/bytes bound by up to 64. All requests now admit against ONE process-global ChatAdmissionController so the bound holds against fake-credential sharding. Per-request session identity survives only as a fairness scheduling key: waiters are grouped per key and served round-robin (#9654) against the shared budget — one connection's burst cannot starve others. - src/shared/middleware/chatBodyAdmission.ts: delete lane map + LRU/TTL eviction; ChatAdmissionController is now the global budget with per-key FIFO queues + round-robin dispatchFair(). PerConnectionAdmissionController returns the same shared controller for every session. resolveSessionId stays as a scheduling key with honest re-scoping docs. snapshot() emits process-wide aggregates. - tests/unit/chat-body-admission-aggregate-10110.test.ts: new U6 suite — 6 deterministic tests (LRU-no-mint, TTL-no-mint, shared byte budget, 16 MiB config, same-session recreation, round-robin fairness). RED on release/v3.8.50, GREEN post-fix. - tests/unit/per-connection-admission-9654.test.ts: rewrite the tests that encoded the defect (per-session isolation) to assert the global-budget contract. - docs/reference/ENVIRONMENT.md: OMNIROUTE_CHAT_ADMISSION_MAX_QUEUED_BYTES documented as process-wide; VIRTUAL_TTL_MS/VIRTUAL_MAX_SESSIONS deprecated. * docs(changelog): add #10322 fragment for process-wide admission budget * ci: retrigger checks after transient npm ci network failure in shard 3/4 (ETIMEDOUT) --------- Co-authored-by: Brandon Bennett <brandonbennett@macbookair.myfiosgateway.com>