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* feat(resilience): weekly-429 cooldown for fetcher-less providers (#3709) Ollama Cloud free-tier accounts have a hard WEEKLY request cap. On cap the upstream returns 429 "you (<account>) have reached your weekly usage limit", but ollama-cloud is an apikey-category provider, so the existing oauth-only shouldUseQuotaSignal gate in checkFallbackError skips the subscription-quota-text classifier (Issue #2321) for its 429s -- the account fell through to the generic exponential backoff (~1s, capped at 2min) and got retried every few minutes for the rest of the week (one account took 285x429 in 48h). Adds a new, ungated weekly-usage-limit text classifier that applies a 24h QUOTA_EXHAUSTED cooldown regardless of provider category. Extracted the new classifier -- together with the existing #2321 subscription-quota logic -- into a new open-sse/services/quotaTextCooldowns.ts module so the frozen accountFallback.ts (file-size-baseline cap) didn't have to grow; net effect shrinks accountFallback.ts by 20 lines. This is Phase A of the plan (open-sse/services/accountFallback.ts:1038-1045 "weekly-429 cooldown"); Phase B (generic local request-counter preflight for manual provider_plans dimensions) is a separate, larger follow-up per the plan's own phasing. * chore(6817): re-sync onto release tip; CHANGELOG entry → changelog.d fragment (fragments-first)