chore(beads): add Gas Town runtime files to .gitignore

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

Executed-By: mayor
Role: mayor

.beads/.gitignore

@@ -37,6 +37,13 @@ beads.right.meta.json
 .sync.lock
 sync_base.jsonl
 
+# Gas Town runtime files (local state)
+.gt-types-configured
+PRIME.md
+beads_rig/
+dolt/
+metadata.json
+
 # NOTE: Do NOT add negation patterns (e.g., !issues.jsonl) here.
 # They would override fork protection in .git/info/exclude, allowing
 # contributors to accidentally commit upstream issue databases.