Fix: Replace polling with async runtime events#51
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- Replace MainActor polling with a serialized async event channel. - Deliver terminal input and POSIX signals through Dispatch sources. - Cover task resumption and macOS/Linux event delivery.
- Derive focus and cursor phases from an injectable ContinuousClock. - Keep one deadline task only while visible focus animation is active. - Verify idle runtimes stay asleep and phase timing is deterministic.
- Route terminal I/O through injectable POSIX calls. - Allow isolated descriptors in integration tests. - Preserve current terminal behavior.
- Retry interrupted reads and interrupted or partial writes. - Preserve the first permanent POSIX failure for runtime handling. - Cover retry, partial-write, and hard-error behavior.
- Throw terminal I/O failures from the asynchronous app entry point. - Restore terminal state before propagating runtime failures. - Verify error propagation and cleanup through AppRunner.
- Confirm shutdown cancels active view tasks. - Assert raw mode, cursor state, and alternate screen are restored.
- Replace polling and signal-flag descriptions with runtime events. - Document idle suspension, deadline scheduling, and deterministic cleanup. - Clarify terminal retries and animation phase behavior.
- Keep the public App.main symbol compatible with SwiftUI. - Run the asynchronous application runtime through dispatchMain. - Report runtime failures before returning a nonzero exit status.
This was referenced Jul 20, 2026
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Summary
Closes #9
Checklist
swift buildsucceeds on both)swift test)swiftlint)Test Plan
.taskprogress, idle suspension, real signal/input delivery, injected animation deadlines, interrupted and partial terminal I/O, permanent I/O errors, and shutdown cleanup.