feat(tui): Phase 3B — filter input, post-run auto-exit, context hints

[Exelord]

Summary

Phase 3 polish, plus the requested post-run auto-exit behavior:
the TUI now stays on screen for 3 seconds after the run finishes,
showing a countdown popup. Any key press cancels the timer —
the TUI stays open until the user explicitly quits with q / Ctrl-C.

Tests: 497 → 506.

Changes

Filter input (/)

• New filterEditing: boolean in State + startFilterEdit /
  endFilterEdit key actions in the reducer.
• App's keyboard handler routes printable keys + Backspace + Enter/Esc
  to filter editing when active; passes through to normal nav otherwise.
• selectFilteredTasks is a case-insensitive substring match on
  ${project}#${task} keyed by state.filters[activeView] (per-view,
  not global — Workers view's filter doesn't carry into Queue).
• TaskList title surfaces the active filter so it's never ambiguous.

Post-run auto-exit (3s, cancelable)

Addresses a UX regression: before this PR the TUI tore down ~120ms
after runEnd, so the user could never see the final frame.

• Reducer sets state.autoExitAt = Date.now() + AUTO_EXIT_MS on
  runEnd. AUTO_EXIT_MS = 3000.
• New AutoExit overlay shows the 1Hz countdown ("Closing in Xs…
  Press any key to stay open. q quits immediately.").
• Any key press clears autoExitAt — the reducer deletes the
  field at the top of every key action.
• The 1 Hz sampler tick flips autoExitTriggered once the deadline
  passes.
• startTui now exposes waitForExit(): Promise<void> that resolves
  on q / Ctrl-C OR autoExitTriggered.
• cli/run.ts awaits it between runOrchestrator() returning and
  tui.dispose().

Context-sensitive StatusBar

Keymap hints adapt to:

• Mode: filter-editing → / <typed> (Enter to apply · Esc to cancel);
  help-open → ? close help; default → view-specific hints.
• View: Overview / Graph / Workers / Bottlenecks / Queue each
  surface the keys most relevant to them. Shows view number + name
  on the left.

Test plan

• bun src/bin.ts run format — clean
• bun src/bin.ts run lint — 0 warnings, 0 errors
• bun src/bin.ts run test — 506 pass, 0 fail
• New tests:
  • selectFilteredTasks empty / case-insensitive / per-view
  • reducer: runEnd sets autoExitAt, key clears it, tick triggers
  • reducer: tick before deadline does not trigger
• Manual e2e (silent fallback path verified; the TTY path runs
  startTui({ testing: true }) in the smoke test)

https://claude.ai/code/session_016HXj6HW6bxSn8EYuKcxTD9

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