refactor(commands): replace SlashCommand with Skill tool invocation

Update all workflow command files to use Skill tool instead of SlashCommand:
- Change allowed-tools: SlashCommand(*) → Skill(*)
- Convert SlashCommand(command="/path", args="...") → Skill(skill="path", args="...")
- Update descriptive text references from SlashCommand to Skill
- Remove javascript language tags from code blocks (25 files)

Affected 25 command files across:
- workflow: plan, execute, init, lite-plan, lite-fix, etc.
- workflow/test: test-fix-gen, test-cycle-execute, tdd-plan, tdd-verify
- workflow/review: review-cycle-fix, review-module-cycle, review-session-cycle
- workflow/ui-design: codify-style, explore-auto, imitate-auto
- workflow/brainstorm: brainstorm-with-file, auto-parallel
- issue: discover, discover-by-prompt, plan
- ccw, ccw-debug

This aligns with the actual Skill tool interface which uses 'skill' and 'args' parameters.

.claude/commands/workflow/lite-fix.md

@@ -2,7 +2,7 @@
 name: lite-fix
 description: Lightweight bug diagnosis and fix workflow with intelligent severity assessment and optional hotfix mode for production incidents
 argument-hint: "[-y|--yes] [--hotfix] \"bug description or issue reference\""
-allowed-tools: TodoWrite(*), Task(*), SlashCommand(*), AskUserQuestion(*)
+allowed-tools: TodoWrite(*), Task(*), Skill(*), AskUserQuestion(*)
 ---
 
 # Workflow Lite-Fix Command (/workflow:lite-fix)
@@ -103,7 +103,7 @@ Phase 4: Confirmation & Selection
 
 Phase 5: Execute
    |- Build executionContext (fix-plan + diagnoses + clarifications + selections)
-   +- SlashCommand("/workflow:lite-execute --in-memory --mode bugfix")
+   +- Skill(skill="workflow:lite-execute", args="--in-memory --mode bugfix")
 ```
 
 ## Implementation
@@ -767,7 +767,7 @@ executionContext = {
 **Step 5.2: Execute**
 
 ```javascript
-SlashCommand(command="/workflow:lite-execute --in-memory --mode bugfix")
+Skill(skill="workflow:lite-execute", args="--in-memory --mode bugfix")
 ```
 
 ## Session Folder Structure