v0.16.1

Fixed

• Telemetry duplicate events: a session could be reported twice (Claude Desktop firing SessionStart more than once on reopen). Sends are now guarded by an at-most-once claim (exclusive sent-<id> sentinel, GC'd), and the per-session dedup id is derived deterministically from install_id + session_id so every code path yields the same id and PostHog collapses re-sends.
• Client-only change; no relay redeploy needed.