fix(quota): drop bespoke quota caches on upstream 429

[maxmad64bis]

⚠️ base-red inherited: #15306

Summary

After a real 429, the limits screen keeps the usage read before the refusal for up to a minute, and the preflight re-admits the connection just refused. That stale read comes from a 429 path that drops only the codex and generic quota caches. Each fetcher now registers how to drop its own cache, and the 429 path uses that registry, so the next preflight reads fresh usage; a non-429 response or a probe-origin failure keeps the cache.

Related Issues

• Related to fix(quota): drop generic quota cache on upstream 429 #12325

Target Branch

• Base is the active release/v3.8.x branch (the highest open release/v*), not main
• New feature? From 3.8.55 on it is held with the v4-feature label for the v4 channel

Validation

• Change type: provider
• Focused tests and category gates from the golden path
• npm run lint
• Reconciled with the current active release base; focused checks rerun afterward
• Production-code changes include a new or updated automated test in this PR

Tests Added Or Updated

• tests/unit/quota-cache-invalidation-on-429.test.ts — new: the site and the v0/tavily fetchers refetch on a 429; other statuses, probe-origin failures and registered keys are covered.
• tests/unit/generic-quota-fetcher.test.ts — renamed dispatcher; the same 429, 200, probe and padding cases.
• tests/unit/chatcore/execute-provider-request.test.ts — new shape case: the 429 site uses the shared dispatcher.

Coverage Notes

Fetcher files sit in open-sse/services/, their test files in tests/unit/.

• open-sse/handlers/chatCore/executeProviderRequest.ts — chatcore/execute-provider-request.test.ts, antigravity-429-quota-cooldown.test.ts.
• agentrouterQuotaFetcher.ts — agentrouter-quota-fetcher.test.ts.
• bailianQuotaFetcher.ts — bailian-quota-fetcher.test.ts.
• codexQuotaFetcher.ts — codex-quota-fetcher.test.ts.
• context7QuotaFetcher.ts — context7-quota-fetcher.test.ts.
• crofUsageFetcher.ts — crof-usage-fetcher.test.ts.
• deepseekQuotaFetcher.ts — deepseek-quota-fetcher.test.ts.
• firecrawlQuotaFetcher.ts — firecrawl-quota-fetcher.test.ts.
• genericQuotaFetcher.ts — generic-quota-fetcher.test.ts.
• grokCliQuotaFetcher.ts — grok-cli-quota-fetcher.test.ts.
• grokQuotaFetcher.ts — grok-quota-fetcher.test.ts.
• jinaQuotaFetcher.ts — jina-quota-fetcher.test.ts.
• llmgatewayQuotaFetcher.ts — llmgateway-quota-fetcher.test.ts.
• lyceumQuotaFetcher.ts — lyceum-quota-fetcher.test.ts.
• moonshotQuotaFetcher.ts — moonshot-quota-fetcher.test.ts.
• opencodeQuotaFetcher.ts — opencode-quota-fetcher.test.ts.
• openrouterQuotaFetcher.ts — openrouter-quota-6842.test.ts.
• quotaPreflight.ts — quota-cache-invalidation-on-429.test.ts (registry case), newapi-aggregator-preflight-dispatch.test.ts.
• qwenTokenPlanQuotaFetcher.ts — qwen-token-plan-quota-fetcher.test.ts.
• tavilyQuotaFetcher.ts — tavily-quota-fetcher.test.ts.
• v0QuotaFetcher.ts — v0-quota-fetcher.test.ts.
• xaiOauthQuotaFetcher.ts — xai-oauth-quota-fetcher.test.ts.

Reviewer Notes

• Behavior: a 429 now drops the codex cache even when persisting the child quota state raises (before, nothing dropped on that path); providers without a registered invalidator keep the generic drop.
• Merge: after fix(quota): route quota fetcher reads through the connection proxy #15885, fix(quota): route remaining console quota reads through the connection proxy #16344.