Add per-PTY dispatch sources and TaskNotifier bypass#580

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chall37 wants to merge 38 commits into

gnachman:masterfrom

chall37:feat/fairness-scheduler-v3

Commits on Feb 12, 2026

Add backpressure counter for monitoring token queue load
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Fix backpressure counter initialization and document high-priority bypass
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Add backpressure release handler and queue cleanup accounting
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Add FairnessScheduler with feature flag integration
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Add feature flag gating tests and fix sessionId=0 bug
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Remove accidentally added utility script
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Added thread access annotations.
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Add queue access annotations to new TokenExecutor vars.
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Add queue annotations and preconditions to executeTurn/cleanupForUnregistration.
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Add dispatchPreconditions to FairnessScheduler internal methods.
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Extract signalAndRelease() helper in TokenArray.
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Move FairnessSchedulerExecutor conformance to extension.
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Cache useFairnessScheduler flag at TokenExecutorImpl init time.
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Replace executionScheduled flag with IdempotentOperationJoiner
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Rewrite executeTurn() to align with execute() patterns
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Add TokenExecutorDeferCompletionOrderingTests for high-priority task ordering.
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Preserve tokens on unregister and move registration to setTerminalEnabled
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Fix deadlock in FairnessScheduler by using private Mutex instead of mutation queue
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Add session restoration tests and fix cleanup tests for token preservation
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Improve fairness scheduler test quality and reliability
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Remove dead discardAllAndReturnCount() methods from TwoTierTokenQueue
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Restore async dispatch for FairnessScheduler hot path to fix performance regression
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Increase FairnessScheduler token budget from 500 to 1000
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Optimize FairnessScheduler callback path and skip legacy session tracking
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Add threading documentation to FairnessSchedulerExecutor protocol methods
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Set isRegistered flag on FairnessScheduler registration
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Add thread access documentation to TokenExecutorImpl member variables
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Add per-PTY dispatch sources and optimize FairnessScheduler callback path
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Add missing VT100ScreenDelegate methods to FakeSession
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Change dispatchPrecondition gate from DEBUG to ITERM_DEBUG
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Address PR #568 review feedback
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Wire coprocess I/O to dispatch sources and fix addTokens blocking _ioQueue
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Fix scheduler stall when session unregisters during executeTurn
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Fix test failures: enable fairness scheduler flag, remove dead ITERM_DEBUG guards, fix races
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Add test for didRegister backpressure wiring order
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Wire backpressure dependencies before starting dispatch sources
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Add thread safety annotations and debug queue assertions
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Add test for startup race with preloaded pipe data under heavy backpressure
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