chore: update beads 0.49.6→0.52.0 and gastown, make gastown a proper flake

- beads: update to 0.52.0 (16af00d7), refresh vendorHash
- gastown: update to 35157d02, remove flake=false now that upstream has flake.nix
- gastown: add inputs.nixpkgs.follows and inputs.beads.follows to deduplicate deps
- Clean up stale comments

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

home/roles/development/default.nix

@@ -5,11 +5,10 @@ with lib;
 let
   cfg = config.home.roles.development;
 
-  # Build beads from flake input with corrected vendorHash
-  # The upstream default.nix has stale vendorHash for commits with server mode
+  # Build beads from flake input
   beadsRev = builtins.substring 0 8 (globalInputs.beads.rev or "unknown");
 
-  # nixpkgs ships Go 1.25.5, but beads' dolt deps require Go >= 1.25.6
+  # beads' dolt deps require Go >= 1.25.6 (GOTOOLCHAIN=auto can't download in sandbox)
   go_1_25_6 = pkgs.go_1_25.overrideAttrs (old: rec {
     version = "1.25.6";
     src = pkgs.fetchurl {
@@ -21,12 +20,11 @@ let
 
   beadsPackage = buildGoModule_1_25_6 {
     pname = "beads";
-    version = "0.49.6-${beadsRev}";
+    version = "0.52.0-${beadsRev}";
     src = globalInputs.beads;
     subPackages = [ "cmd/bd" ];
     doCheck = false;
-    # Regenerated vendorHash for commit 6a51223b (dolt server mode, Go 1.25.6)
-    vendorHash = "sha256-9RMy0+ZBFg1BAl8Z0EuZK4XVm9QYVekS9i/1ErOIB/c=";
+    vendorHash = "sha256-M+JCxrKgUxCczYzMc2czLZ/JhdVulo7dH2YLTPrJVSc=";
     nativeBuildInputs = [ pkgs.git pkgs.pkg-config ];
     buildInputs = [ pkgs.icu ];
     meta = with lib; {
@@ -37,7 +35,7 @@ let
     };
   };
 
-  # Gastown - multi-agent workspace manager (no upstream flake.nix yet)
+  # Gastown - multi-agent workspace manager
   # Source is tracked via flake input for renovate updates
   gastownRev = builtins.substring 0 8 (globalInputs.gastown.rev or "unknown");
   gastownPackage = pkgs.buildGoModule {