v1.8.4 — Zombie Session Detection, cmux Cross-Window Jump & Code Light Sync Preview

New Features

• Zombie session detection: Sessions whose terminal process has died (force-quit, kill, crash) are automatically detected via kill(pid, 0) every 30s and marked as ended
• Ended session visual state: Ended sessions display with reduced opacity, "Ended" tag, and no terminal jump button
• Clear Ended button: Settings menu includes "Clear Ended" to remove all ended sessions at once
• cmux cross-window jumping: Terminal jump now works across different cmux windows via native AppleScript
• Code Light Sync preview: README updated with Code Light iPhone companion app preview — real Dynamic Island, remote chat, slash commands, image attachments, permanent pair codes

Bug Fixes

• Swift 6 actor isolation: DebugLogger marked as nonisolated + Sendable, eliminating actor isolation warnings
• Thread safety: HookSocketServer.cancelPendingPermissions now properly wrapped in Task { @MainActor in } for thread-safe cleanup
• errno defensive coding: PosixLivenessChecker.isAlive() splits kill() result and errno check into separate statements

Tests

• SessionFilterTests — validates rate-limit noise filtering and ended session display logic
• ZombieScanTests — validates zombie detection with mock liveness checker

Contributors

• @jiamangu — Zombie session detection & ended state UI (PR #11), Usage warning notification (PR #3)
• @Liar-zzy — cmux cross-window jumping via native AppleScript (PR #22)

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