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* refactor: split pty-connection.ts under 400 lines * rm design doc * refactor(pty-connection): extract reattach payload handlers as factories - Replace bindApplyReattachPayload with createReattachPayloadHandlers factory that returns handlers instead of mutating session directly, enabling better composability and testing - Extract waitForUserInitiatedSshConnect as standalone function for reuse across deferred session attach flows - Create ReattachPayloadSession type to document and isolate required session capabilities - Add test coverage for overlapping reattach payload attempts - Clean up comments to remove redundant prefixes (session.pane → pane, session.transport → transport) * fix(pty-connection): correct sequencing and state bugs in spawn and reat - Fix terminal tail slice to take prefix instead of suffix, preserving escape sequence markers needed by next scan - Clear pending pane serializer when direct SSH retry PTY is unclaimed - Initialize interrupt status baseline to undefined so first input advances sequence counter - Bump reattach generation only after confirming current attempt owns the stream, preventing superseded results from canceling in-flight prepaint * fix(pty-connection): correct sequencing and state bugs in spawn and reat - Fix terminal tail slice to take prefix instead of suffix, preserving escape sequence markers needed by next scan - Clear pending pane serializer when direct SSH retry PTY is unclaimed - Initialize interrupt status baseline to undefined so first input advances sequence counter - Bump reattach generation only after confirming current attempt owns the stream, preventing superseded results from canceling in-flight prepaint * fix(test): increase poll iterations to prevent Node 26 test leakage Increase event loop turns from 40 to 200 in the timer settlement loop. Node 26's libuv poll phase can briefly starve when concurrent workers transform tests, causing cleanup to leak into the next test. The higher iteration count ensures async operations complete before returning. * fix(foreground-output-budgets): use >= for budget window boundary check At the exact window boundary, the budget should roll over. Change the comparison from > to >= so the window resets when now equals windowStart + FOREGROUND_BUDGET_WINDOW_MS, not just after. Add tests to verify budget rejection and rollover behavior. * refactor(pty-connection): add status observations and routing improvemen - Track agent status observations with origin and transition metadata - Separate interactive redraw input timing from general terminal input - Restore pane authority on bind and reattach - Refine routing trust and confirmation state handling - Invoke queued startup callbacks when PTY is bound - Resolve Windows shell overrides with user settings * refactor: extract resolveLaunchAgentCandidate helper Consolidate duplicated launch-agent resolution logic into a shared helper to prevent future divergence between paneExpectsLaunchAgent and resolveExpectedLaunchTuiAgent. * refactor(pty-connection): use model snapshot for direct SSH reconnects Direct SSH reconnects now restore from the full SSH model snapshot (complete scrollback) when dimensions are compatible, instead of the bounded relay tail. Falls back gracefully when incompatible or alternate-screen was exited. * refactor(pty): retry unverifiable SSH reattaches via preserved bindings Preserve deferred SSH session IDs longer when they serve as the only retry binding, allowing the system to attempt recovery through direct SSH retries or PTY remounts when reattach fails in an unverifiable way. Simplify reconnect model restoration by removing the conditional model snapshot probe and using relay replay directly. * test: poll terminal readiness in expectSingleOwningPty Retry the terminal list assertion with polling to account for timing delays in PTY state reporting from the runtime.