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/brainstorm-with-file.md

@@ -753,15 +753,15 @@ AskUserQuestion({
 // Handle selections
 if (selection.includes("创建实施计划")) {
   const topIdea = synthesis.top_ideas[0]
-  SlashCommand("/workflow:plan", `实施: ${topIdea.title} - ${topIdea.description}`)
+  Skill(skill="workflow:plan", args=`实施: ${topIdea.title} - ${topIdea.description}`)
 }
 if (selection.includes("创建Issue")) {
   for (const idea of synthesis.top_ideas.slice(0, 3)) {
-    SlashCommand("/issue:new", `${idea.title}: ${idea.next_steps[0]}`)
+    Skill(skill="issue:new", args=`${idea.title}: ${idea.next_steps[0]}`)
   }
 }
 if (selection.includes("深入分析")) {
-  SlashCommand("/workflow:analyze-with-file", synthesis.top_ideas[0].title)
+  Skill(skill="workflow:analyze-with-file", args=synthesis.top_ideas[0].title)
 }
 if (selection.includes("导出分享")) {
   exportBrainstormReport(sessionFolder)