fix(cli): clean TTY handoff to claude via spawnSync + defensive reset

Terminals spawned by `claudemesh launch` were dropping keystrokes at
claude's prompt and showing the launch wizard re-rendering on top of
claude's TUI. Two compounding causes:

1. spawn() + child.on('exit') kept the parent node event loop alive
   during claude's lifetime. Any stray readline 'data' listener or
   late render from the wizard could fire on the inherited stdin/
   stdout, stealing keystrokes or painting over claude's Ink TUI.
2. Raw mode / alt-screen / hidden cursor set by the wizard helpers
   was not reliably restored before the handoff.

Fix:
- Swap spawn for spawnSync so the parent event loop is fully blocked
  while claude runs. No listener or setImmediate can fire during
  claude's lifetime.
- Hard TTY reset right before the spawn: setRawMode(false),
  removeAllListeners on stdin, show cursor (ESC[?25h), exit alt
  screen (ESC[?1049l). Defensive — survives partial wizard cleanup.
- Move cleanup() registration to process.on('exit') so it runs
  synchronously on every exit path (normal, signal, throw).
- Preserve signal forwarding: if claude dies from a signal, re-raise
  the same signal on the parent so exit codes propagate correctly.

Bumps to v0.10.6.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/cli/package.json

@@ -1,6 +1,6 @@
 {
   "name": "claudemesh-cli",
-  "version": "0.9.2",
+  "version": "0.10.6",
   "description": "Claude Code MCP client for claudemesh — peer mesh messaging between Claude sessions.",
   "keywords": [
     "claude-code",