Update source code and remove runtime data from tracking

Add gitignore rules for browser session data, SQLite databases,
media downloads, and build artifacts. Remove previously tracked
runtime files from the repository.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitignore

@@ -25,3 +25,16 @@ Thumbs.db
 
 # TypeScript
 *.tsbuildinfo
+tsc-errors.txt
+tsc-out.txt
+
+# Runtime data
+data/browser-session/
+data/reddit-bot.db
+data/reddit-bot.db-shm
+data/reddit-bot.db-wal
+data/chat-cache.json
+data/media/
+
+# Claude Code
+.claude/worktrees/