chore: regenerate AGENTS.md knowledge base

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src/features/tmux-subagent/AGENTS.md

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+# src/features/tmux-subagent/ — Tmux Pane Management
+
+**Generated:** 2026-02-18
+
+## OVERVIEW
+
+28 files. State-first tmux integration managing panes for background agent sessions. Handles split decisions, grid planning, polling, and lifecycle events.
+
+## CORE ARCHITECTURE
+
+```
+TmuxSessionManager (manager.ts)
+  ├─→ DecisionEngine: Should we spawn/close panes?
+  ├─→ ActionExecutor: Execute spawn/close/replace actions
+  ├─→ PollingManager: Monitor pane health
+  └─→ EventHandlers: React to session create/delete
+```
+
+## KEY FILES
+
+| File | Purpose |
+|------|---------|
+| `manager.ts` | `TmuxSessionManager` — main class, session tracking, event routing |
+| `decision-engine.ts` | Evaluate window state → produce `SpawnDecision` with actions |
+| `action-executor.ts` | Execute `PaneAction[]` (close, spawn, replace) |
+| `grid-planning.ts` | Calculate pane layout given window dimensions |
+| `spawn-action-decider.ts` | Decide spawn vs replace vs skip |
+| `spawn-target-finder.ts` | Find best pane to split or replace |
+| `polling-manager.ts` | Health polling for tracked sessions |
+| `types.ts` | `TrackedSession`, `WindowState`, `PaneAction`, `SpawnDecision` |
+
+## PANE LIFECYCLE
+
+```
+session.created → spawn-action-decider → grid-planning → action-executor → track session
+session.deleted → cleanup tracked session → close pane if empty
+```
+
+## LAYOUT CONSTRAINTS
+
+- `MIN_PANE_WIDTH`: 52 chars
+- `MIN_PANE_HEIGHT`: 11 lines
+- Main pane preserved (never split below minimum)
+- Agent panes split from remaining space
+
+## EVENT HANDLERS
+
+| File | Event |
+|------|-------|
+| `session-created-handler.ts` | New background session → spawn pane |
+| `session-deleted-handler.ts` | Session ended → close pane |
+| `session-created-event.ts` | Event type definition |