fix(hooks): 🐛 repair post-create hook execution, output rendering, and launch

[CarmeloCampos]

Summary

The post-create hook system was broken end-to-end: hook output corrupted the TUI, and the worktree selector never launched after a successful hook (the screen stayed stuck).

Changes

• src/hooks.ts
  • Stream stdout/stderr as UTF-8 (setEncoding) so multibyte characters are not corrupted across chunk boundaries.
  • Exactly-once completion callback (spawn error + close no longer double-fire).
  • Abort terminates the whole process tree: POSIX process-group kill with SIGTERM → SIGKILL escalation, taskkill /t /f on Windows. No output/completion after abort.
  • Added normalizeHookOutput: strips ANSI/VT/OSC escape sequences (stripVTControlCharacters) and applies carriage-return overwrite + CRLF semantics for progress output.
• src/ui.ts
  • Bounded raw output tail (64 KB) and normalization before display — large/noisy hooks (e.g. bun install && codegraph init && codegraph index && codegraph sync) no longer corrupt the frame or accumulate unboundedly.
  • hideHookOutput() now returns the pending worktree path before clearing it; success, "open anyway", cancel, and Ctrl+C abort all capture the path first — the launch command now runs in the correct worktree and the dead/stuck UI is gone.
  • Clear the launch timer on teardown; accurate "Hook completed. Launching..." instructions.
  • Worktree/branch creation submits on ENTER instead of CHANGE — OpenTUI 0.1.75 emits CHANGE on blur(), so pressing Esc was silently creating worktrees/branches.
  • Failure prompt uses the configured launch command name instead of hardcoded opencode.
• test/hooks.test.ts + "test": "bun test" script
  • 11 tests: ANSI/OSC stripping, CR overwrite, CRLF, unicode preservation, UTF-8 chunk decoding, exactly-once completion, abort suppression, spawn-error handling, and a realistic colored-progress pipeline.

Verification

• bun test — 11 pass
• bunx tsc --noEmit — only pre-existing @opentui/core module-resolution errors (present on clean main)
• bun run build:single — builds cleanly

Out of scope

• Detached hook renderable destruction (leak after many cancel cycles) and launch-spawn error handling — pre-existing, can follow up separately.