CLI 0.2.1 — Daemon lifecycle hardening

This patch release hardens local daemon process management and CLI authentication session handling.

Highlights

• Hardened nca daemon start and stop behavior with shared pidfile handling.
• Added stale-pid recovery when a previous daemon process exited unexpectedly.
• Added a start lock to avoid overlapping daemon launches.
• Propagated daemon-stopped state back to agents more reliably.
• Bounded CLI login sessions and consumed login state atomically.

Notes

• This release focuses on reliability for local machine runtimes and browser-based CLI login.