chore(beads): update .gitignore and config.yaml

- Add sync state files to .gitignore (.sync.lock, sync_base.jsonl)
- Add types.custom to config.yaml for Gas Town type fallback
- Remove metadata.json from .gitignore (it should be tracked)

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

Executed-By: mayor
Role: mayor

.beads/.gitignore

@@ -32,9 +32,13 @@ beads.left.meta.json
 beads.right.jsonl
 beads.right.meta.json
 
+# Sync state (local-only, per-machine)
+# These files are machine-specific and should not be shared across clones
+.sync.lock
+sync_base.jsonl
+
 # 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.
 # The JSONL files (issues.jsonl, interactions.jsonl) and config files
 # are tracked by git by default since no pattern above ignores them.
-metadata.json

.beads/config.yaml

@@ -51,4 +51,6 @@ sync-branch: "beads-metadata"
 # - linear.url
 # - linear.api-key
 # - github.org
-# - github.repo
+# - github.repo
+# Custom issue types for Gas Town (fallback when database is unavailable)
+types.custom: "agent,role,rig,convoy,slot,queue,event,message,molecule,gate,merge-request"