Add gastown postPatch bug fixes from jt flake

- Fix mail router normalization in validateRecipient
- Fix agentBeadToAddress to use title field for hq- prefixed beads
- Fix crew/polecat home paths (remove incorrect /rig suffix)
- Fix town root detection (RoleUnknown instead of RoleMayor)
- Fix copyDir symlink handling
- Pin to gastown commit 177094a matching jt flake

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

home/roles/development/default.nix

@@ -18,7 +18,7 @@ let
     pname = "gastown";
     version = "unstable-${gastownRev}";
     src = globalInputs.gastown;
-    vendorHash = "sha256-+qaxEZgC2u51O458p3ZqZ333E/R0iRb+uKhKn8GcJJo=";
+    vendorHash = "sha256-ripY9vrYgVW8bngAyMLh0LkU/Xx1UUaLgmAA7/EmWQU=";
     subPackages = [ "cmd/gt" ];
     doCheck = false;