v0.12.4

[0.12.4] - 2026-08-20

Fixed

• Removed repository-scale manifest traversal and recursive platform-watcher
  registration from the interactive first-frame path. The TUI now constructs
  its manifest backend dormant, retains local fallback workspace operations,
  and opens the scanner's one-way activation gate only after the renderer has
  flushed a visible, input-ready frame. The macOS PTY regression exercises a
  25,000-file workspace, requires the manifest activation trace to be the first
  post-frame operation, and retains the hard three-second ceiling and visible
  loading assertion. Headless smoke keeps its explicit activation contract.
• Manifest cancellation now begins immediately after the terminal event loop
  exits, before other background-service teardown. The macOS PTY regression
  blocks the initial post-frame Git scan, requires bounded session-save and
  process-group cleanup, and wraps Expect in an independent process deadline.