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/tdd-verify.md

@@ -2,7 +2,7 @@
 name: tdd-verify
 description: Verify TDD workflow compliance against Red-Green-Refactor cycles. Generates quality report with coverage analysis and quality gate recommendation. Orchestrates sub-commands for comprehensive validation.
 argument-hint: "[optional: --session WFS-session-id]"
-allowed-tools: SlashCommand(*), TodoWrite(*), Read(*), Write(*), Bash(*), Glob(*)
+allowed-tools: Skill(*), TodoWrite(*), Read(*), Write(*), Bash(*), Glob(*)
 ---
 
 # TDD Verification Command (/workflow:tdd-verify)
@@ -179,7 +179,7 @@ Calculate:
 
 **Step 3.1: Call Coverage Analysis Sub-command**
 ```bash
-SlashCommand(command="/workflow:tools:tdd-coverage-analysis --session {session_id}")
+Skill(skill="workflow:tools:tdd-coverage-analysis", args="--session {session_id}")
 ```
 
 **Step 3.2: Parse Output Files**