claude-code: test plugin collisions

Cover duplicate personal-plugin directory names and collisions between managed plugins and configured skills.

tests/modules/programs/claude-code/collision-assertions.nix

@@ -0,0 +1,29 @@
+{ config, ... }:
+let
+  plugin = ./test-plugin;
+  pluginDirName = baseNameOf (toString plugin);
+in
+{
+  programs.claude-code = {
+    enable = true;
+    package = config.lib.test.mkStubPackage {
+      name = "claude-code";
+      version = "2.1.157";
+      buildScript = ''
+        mkdir -p $out/bin
+        touch $out/bin/claude
+        chmod 755 $out/bin/claude
+      '';
+    };
+    plugins = [
+      plugin
+      plugin
+    ];
+    skills.${pluginDirName} = "test skill";
+  };
+
+  test.asserts.assertions.expected = [
+    "`programs.claude-code.plugins` entries must resolve to unique personal-plugin directory names"
+    "`programs.claude-code.skills` and managed plugins must have unique directory names"
+  ];
+}

tests/modules/programs/claude-code/default.nix

@@ -7,6 +7,7 @@
   claude-code-mcp-lsp = ./mcp-lsp.nix;
   claude-code-mcp-integration = ./mcp-integration.nix;
   claude-code-assertion = ./assertion.nix;
+  claude-code-collision-assertions = ./collision-assertions.nix;
   claude-code-context-inline = ./memory-management.nix;
   claude-code-context-path = ./memory-from-source.nix;
   claude-code-rules-dir = ./rules-dir.nix;