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Adds UsageTracker to src/runtime/usage.zig: - Rolling 5-hour window with automatic reset - Thread-safe: all mutations guarded by mutex - record(backend): increments call count for claude or codex - nearLimit(backend, quota, warn_at_percent): checks if calls exceed threshold fraction of quota - callCount/totalCalls: current window counts - windowRemainingSeconds: time left in current window - Global singleton via usage.global() with lazy init Wires into dispatch.zig: every dispatch() call now records usage for the dispatched backend. 9 new tests: record, nearLimit (trigger/below/zero-quota), window reset, remaining seconds, global singleton, concurrent safety with 4 threads x 100 records. All 12 tests pass (9 usage + 3 types). Made-with: Cursor
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Summary
UsageTracker(src/runtime/usage.zig): Thread-safe call counter with a rolling 5-hour windowrecord(backend): increment call count per backendnearLimit(backend, quota, warn_pct): check if calls exceed thresholdcallCount()/totalCalls(): current window countswindowRemainingSeconds(): time left in windowusage.global()with lazy initdispatch.zig: Everydispatch()call now records usage viausage.global().record()This provides the counting layer (Layer 0 per issue spec). The load-balancing in
resolve()(Layer 1) can usenearLimit()to overflow to the secondary provider.Test plan
zig test src/runtime/usage.zig— 12/12 tests pass (9 usage + 3 types)Closes #268
Made with Cursor