feat(#789): elevate CodeBuddy — slash commands (#830)

* feat(#789): elevate CodeBuddy — emit slash commands (+ document subagent/MCP scope)

Emit a CodeBuddy slash-command surface so GSD workflows appear in the
'/' menu, reaching parity with other elevated runtimes.

- Add convertClaudeCommandToCodebuddyCommand and register a commands/
  artifact kind for the codebuddy runtime (commands/gsd-<name>.md),
  consistent with the Cursor (#785) and Augment (#790) commands surfaces.
- Mark emitted skills user-invocable:false so the commands surface is the
  sole '/' entry point (no duplicate /gsd-* entries); skills stay
  model-invocable. CodeBuddy's SKILL.md supports this field.
- Normalize $HOME/.codebuddy (bare + slash) path forms in runtime
  rewrites so --config-dir/local installs don't leak the default home.
- Report installed commands/ count on install; uninstall prunes gsd-*
  commands while preserving user-owned commands.

Scope: subagents (~/.codebuddy/agents/) are already emitted by the
generic agents block (unchanged); no mcp.json is written (gsd ships no
MCP server, and CodeBuddy's mcp.json registers only external servers).

Closes #789

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* chore(#789): set changeset pr number to 830

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

src/runtime-artifact-layout.cts

@@ -345,7 +345,17 @@ function resolveRuntimeArtifactLayout(runtime: string, configDir: string, scope:
       break;
 
     case 'codebuddy':
-      kinds = [skillsKind('skills', 'gsd-', 'convertClaudeCommandToCodebuddySkill', 'codebuddy', configDir)];
+      // CodeBuddy (Tencent) reads two user-level surfaces (codebuddy.ai/docs/cli):
+      //   1. commands/gsd-<name>.md      — slash commands shown in the '/' menu (#789)
+      //   2. skills/gsd-<name>/SKILL.md  — model-invocable skills, emitted with
+      //      user-invocable:false so they stay OUT of '/' (the commands surface is
+      //      the sole '/' entry point) — avoids a duplicated /gsd-* per workflow.
+      // Subagents (~/.codebuddy/agents/) are already emitted by the generic agents
+      // block in bin/install.js; MCP is excluded (gsd ships no MCP server).
+      kinds = [
+        convertedCommandsKind('commands', 'gsd-', 'convertClaudeCommandToCodebuddyCommand', configDir),
+        skillsKind('skills', 'gsd-', 'convertClaudeCommandToCodebuddySkill', 'codebuddy', configDir),
+      ];
       break;
 
     case 'cline':