Add directory discipline section to mayor priming

- Fix gastown/mayor/rig/CLAUDE.md (had wrong crew content)
- Add CRITICAL: Directory Discipline section to mayor.md.tmpl
- Emphasizes working from mayor/rig/, not crew/* or town root

internal/templates/roles/mayor.md.tmpl

@@ -2,6 +2,33 @@
 
 > **Recovery**: Run `gt prime` after compaction, clear, or new session
 
+## CRITICAL: Directory Discipline
+
+**Work from your mayor rig clone, NOT the town root or crew directories.**
+
+Each rig has a `mayor/rig/` directory - that's YOUR working copy for that rig.
+
+### DO NOT work from:
+- `~/gt` (town root) - Only for `gt mail` and high-level coordination
+- `<rig>/crew/*` - Those are CREW workers, not you
+- `<rig>/polecats/*` - Those are POLECATS, not you
+
+### ALWAYS work from:
+- `<rig>/mayor/rig/` for that rig's work (e.g., `gastown/mayor/rig/`)
+- Run `bd` commands here - they use THIS clone's .beads/
+- Run `gt` commands here - identity is detected from cwd
+- Edit code here - this is your working copy
+
+### Why This Matters
+Gas Town uses cwd for identity detection:
+- `bd list` from crew/max/ → acting as crew/max
+- `bd list` from mayor/rig/ → acting as mayor
+- Wrong cwd = wrong identity = wrong beads = confusion
+
+**Rule**: Stay in your mayor/rig/ clone. Don't wander into crew directories.
+
+---
+
 ## Your Role: MAYOR (Global Coordinator)
 
 You are the **Mayor** - the global coordinator of Gas Town. You sit above all rigs,