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/ccw.md

@@ -2,7 +2,7 @@
 name: ccw
 description: Main workflow orchestrator - analyze intent, select workflow, execute command chain in main process
 argument-hint: "\"task description\""
-allowed-tools: SlashCommand(*), TodoWrite(*), AskUserQuestion(*), Read(*), Grep(*), Glob(*)
+allowed-tools: Skill(*), TodoWrite(*), AskUserQuestion(*), Read(*), Grep(*), Glob(*)
 ---
 
 # CCW Command - Main Workflow Orchestrator
@@ -33,12 +33,12 @@ Main process orchestrator: intent analysis → workflow selection → command ch
 
 ## Execution Model
 
-**Synchronous (Main Process)**: Commands execute via SlashCommand in main process, blocking until complete.
+**Synchronous (Main Process)**: Commands execute via Skill in main process, blocking until complete.
 
 ```
 User Input → Analyze Intent → Select Workflow → [Confirm] → Execute Chain
                                                               ↓
-                                                    SlashCommand (blocking)
+                                                    Skill (blocking)
                                                               ↓
                                                     Update TodoWrite
                                                               ↓
@@ -353,7 +353,7 @@ async function executeCommandChain(chain, workflow) {
   for (let i = 0; i < chain.length; i++) {
     try {
       const fullCommand = assembleCommand(chain[i], previousResult);
-      const result = await SlashCommand({ command: fullCommand });
+      const result = await Skill({ skill: fullCommand });
 
       previousResult = { ...result, success: true };
       updateTodoStatus(i, chain.length, workflow, 'completed');
@@ -440,7 +440,7 @@ Phase 4: Setup TODO Tracking
 Phase 5: Execute Command Chain
     |-- For each command:
     |   |-- Assemble full command
-    |   |-- Execute via SlashCommand
+    |   |-- Execute via Skill
     |   |-- Update TODO status
     |   +-- Handle errors (retry/skip/abort)
     +-- Return workflow result
@@ -469,7 +469,7 @@ Phase 5: Execute Command Chain
 
 ## Key Design Principles
 
-1. **Main Process Execution** - Use SlashCommand in main process, no external CLI
+1. **Main Process Execution** - Use Skill in main process, no external CLI
 2. **Intent-Driven** - Auto-select workflow based on task intent
 3. **Port-Based Chaining** - Build command chain using port matching
 4. **Minimum Execution Units** - Commands grouped into atomic units, never split (e.g., lite-plan → lite-execute)
@@ -531,7 +531,7 @@ todos = [
 
 | Aspect | ccw | ccw-coordinator |
 |--------|-----|-----------------|
-| **Type** | Main process (SlashCommand) | External CLI (ccw cli + hook callbacks) |
+| **Type** | Main process (Skill) | External CLI (ccw cli + hook callbacks) |
 | **Execution** | Synchronous blocking | Async background with hook completion |
 | **Workflow** | Auto intent-based selection | Manual chain building |
 | **Intent Analysis** | 5-phase clarity check | 3-phase requirement analysis |