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0321bc8e2e
Re-land of the account-lease half of #10011 on the current release branch. Its exact-model-scoping half had already shipped in #8050 and its quota half lost to the tip's aggregate-family design (selectAntigravityQuotaWindowNames / antigravityQuotaFamily.ts); none of that is reintroduced here. The lease is a concurrency reservation only and never reads or writes quota state. The Antigravity account selected for a request is reserved for the whole streaming lifecycle of that request, so a concurrent retry — or the credential handoff inside getProviderCredentialsWithQuotaPreflight — cannot re-pick an account already committed to an in-flight upstream stream. The reservation is scoped to (connection, callable upstream model) rather than the whole account, so one account can still serve two different models at once; catalog ids that resolve to the same upstream id (the gemini-3.7-flash tiers, all gemini-3.7-flash-tiered) share one lease. When every eligible account is leased for that model the request returns a structured 503 antigravity_pool_busy with a bounded Retry-After instead of piling onto a busy account. Opt-in behind ANTIGRAVITY_ACCOUNT_LEASE_ENABLED (runtime, default false). With the flag off no reservation is taken, credentials carry no routing descriptor, every release/hold is a no-op on an undefined lease id, and account selection and dispatch behave exactly as before. #10011's original test suite asserted family semantics for a lease that was exact-model scoped and failed deterministically on its own head; the model ids it used (gemini-3.5-flash / gemini-3-flash-agent) no longer exist in the catalog. The contradiction is resolved in favour of one coherent semantic — exact callable upstream model — and the tests assert it against the alias tables as they are on this branch. Co-authored-by: Ardem2025 <openclaw-auto@example.invalid>