story-kit: create 288_bug_ambient_mode_state_lost_on_server_restart

.story_kit/work/1_upcoming/288_bug_ambient_mode_state_lost_on_server_restart.md

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+---
+name: "Ambient mode state lost on server restart"
+---
+
+# Bug 288: Ambient mode state lost on server restart
+
+## Description
+
+Story 282 implemented ambient mode toggle but only in-memory. The acceptance criterion requiring persistence in bot.toml was not implemented. Every server restart (including rebuild_and_restart) clears ambient mode for all rooms.
+
+## How to Reproduce
+
+1. Type "timmy ambient on" — get confirmation
+2. Restart server (or rebuild_and_restart)
+3. Send unaddressed message — bot ignores it, ambient mode is gone
+
+## Actual Result
+
+Ambient mode state is lost on server restart.
+
+## Expected Result
+
+Ambient mode per-room state is persisted in bot.toml and restored on startup.
+
+## Acceptance Criteria
+
+- [ ] Ambient mode per-room state is saved to bot.toml when toggled
+- [ ] Ambient mode state is restored from bot.toml on server startup
+- [ ] bot.toml.example includes the ambient_rooms setting with a comment