Bump to v1.3.0, add commit guidelines to CLAUDE.md

- Version bump to v1.3.0
- Added instruction to bump version and update README on every commit

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

index.html

@@ -217,7 +217,7 @@
 			const emoteEl = document.getElementById("emote");
 			const messageEl = document.getElementById("message");
 			const POLL_INTERVAL = 2000;
-			const VERSION = "v1.2.0";
+			const VERSION = "v1.3.0";
 
 			// Sound system
 			let audioCtx = null;