claude-code: added 'commandsDir' option to specify commands from filesystem

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

@@ -26,11 +26,18 @@
       test-agent = "test content";
     };
     agentsDir = ./agents;
+
+    # assert fail: cannot set commands and commandsDir at the same time.
+    commands = {
+      test-command = "test content";
+    };
+    commandsDir = ./commands;
   };
 
   test.asserts.assertions.expected = [
     "`programs.claude-code.package` cannot be null when `mcpServers` is configured"
     "Cannot specify both `programs.claude-code.memory.text` and `programs.claude-code.memory.source`"
     "Cannot specify both `programs.claude-code.agents` and `programs.claude-code.agentsDir`"
+    "Cannot specify both `programs.claude-code.commands` and `programs.claude-code.commandsDir`"
   ];
 }

tests/modules/programs/claude-code/commands-dir.nix

@@ -0,0 +1,14 @@
+{
+  programs.claude-code = {
+    enable = true;
+    commandsDir = ./commands;
+  };
+
+  nmt.script = ''
+    assertFileExists home-files/.claude/commands/test-command.md
+    assertLinkExists home-files/.claude/commands/test-command.md
+    assertFileContent \
+      home-files/.claude/commands/test-command.md \
+      ${./commands/test-command.md}
+  '';
+}

tests/modules/programs/claude-code/commands/test-command.md

@@ -0,0 +1,6 @@
+---
+allowed-tools: Bash(echo:*)
+description: Test command for commandsDir functionality
+---
+
+This is a test command to verify that commandsDir works correctly.

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

@@ -6,4 +6,5 @@
   claude-code-memory-management = ./memory-management.nix;
   claude-code-memory-from-source = ./memory-from-source.nix;
   claude-code-agents-dir = ./agents-dir.nix;
+  claude-code-commands-dir = ./commands-dir.nix;
 }