* fix(antigravity): per-model quota + 30min credits_exhausted reprobe
- accountFallback.ts: hasPerModelQuota() now treats antigravity/agy as
per-model quota. A single-model 429 no longer cascades to all models
in the provider.
- connectionRecovery.ts: credits_exhausted removed from terminal set;
isCreditsExhaustedReprobeCandidate() with 30min default. Loads
active+inactive rows so inactive credits_exhausted accounts can recover.
- tests/unit/quota-connection-recovery.test.ts: 6 cases covering pure
helpers + tick wiring.
* fix(antigravity): persist projectId and prefer healthy accounts
Save Cloud Code projectId after runtime discovery, skip accounts missing
projectId when alternatives exist, and mark missing_project_id on 422.
* fix(antigravity): skip quota-exhausted models during account selection
Avoid repeatedly dispatching to Antigravity models that already report
exhausted quota, reducing wasted upstream calls and combo fallback latency.
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Co-authored-by: hermes <hermes@nous.local>
