refactor(commands): replace bash/jq operations with ccw session commands

- session/start.md: Replace find/mkdir/echo with ccw session list/init
- session/list.md: Replace find/jq with ccw session list/stats/read
- session/resume.md: Replace jq status updates with ccw session status
- session/complete.md: Replace jq/mv with ccw session archive
- execute.md: Replace session discovery with ccw session list/status
- code-developer.md: Replace jq context-package read with ccw session read

Benefits:
- Atomic operations (no temp files)
- Auto workspace detection (works from subdirectories)
- Auto session location detection (active/archived/lite)
- Status history auto-tracking for tasks
- Consistent error handling

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.claude/commands/workflow/session/start.md

@@ -70,12 +70,12 @@ SlashCommand({command: "/workflow:init"});
 
 ### Step 1: List Active Sessions
 ```bash
-bash(ls -1 .workflow/active/ 2>/dev/null | head -5)
+ccw session list --location active
 ```
 
 ### Step 2: Display Session Metadata
 ```bash
-bash(cat .workflow/active/WFS-promptmaster-platform/workflow-session.json)
+ccw session read WFS-promptmaster-platform --type session
 ```
 
 ### Step 4: User Decision
@@ -92,34 +92,29 @@ Present session information and wait for user to select or create session.
 
 ### Step 1: Check Active Sessions Count
 ```bash
-bash(find .workflow/active/ -name "WFS-*" -type d 2>/dev/null | wc -l)
+ccw session list --location active
+# Check result.total in response
 ```
 
 ### Step 2a: No Active Sessions → Create New
 ```bash
-# Generate session slug
-bash(echo "implement OAuth2 auth" | sed 's/[^a-zA-Z0-9]/-/g' | tr '[:upper:]' '[:lower:]' | cut -c1-50)
+# Generate session slug from description
+# Pattern: WFS-{lowercase-slug-from-description}
 
-# Create directory structure
-bash(mkdir -p .workflow/active/WFS-implement-oauth2-auth/.process)
-bash(mkdir -p .workflow/active/WFS-implement-oauth2-auth/.task)
-bash(mkdir -p .workflow/active/WFS-implement-oauth2-auth/.summaries)
-
-# Create metadata (include type field, default to "workflow" if not specified)
-bash(echo '{"session_id":"WFS-implement-oauth2-auth","project":"implement OAuth2 auth","status":"planning","type":"workflow","created_at":"2024-12-04T08:00:00Z"}' > .workflow/active/WFS-implement-oauth2-auth/workflow-session.json)
+# Create session with ccw (creates directories + metadata atomically)
+ccw session init WFS-implement-oauth2-auth --type workflow --content '{"project":"implement OAuth2 auth","status":"planning"}'
 ```
 
 **Output**: `SESSION_ID: WFS-implement-oauth2-auth`
 
 ### Step 2b: Single Active Session → Check Relevance
 ```bash
-# Extract session ID
-bash(find .workflow/active/ -name "WFS-*" -type d 2>/dev/null | head -1 | xargs basename)
+# Get session list with metadata
+ccw session list --location active
 
-# Read project name from metadata
-bash(cat .workflow/active/WFS-promptmaster-platform/workflow-session.json | grep -o '"project":"[^"]*"' | cut -d'"' -f4)
+# Read session metadata for relevance check
+ccw session read WFS-promptmaster-platform --type session
 
-# Check keyword match (manual comparison)
 # If task contains project keywords → Reuse session
 # If task unrelated → Create new session (use Step 2a)
 ```
@@ -129,8 +124,9 @@ bash(cat .workflow/active/WFS-promptmaster-platform/workflow-session.json | grep
 
 ### Step 2c: Multiple Active Sessions → Use First
 ```bash
-# Get first active session
-bash(find .workflow/active/ -name "WFS-*" -type d 2>/dev/null | head -1 | xargs basename)
+# Get first active session from list
+ccw session list --location active
+# Use first session_id from result.active array
 
 # Output warning and session ID
 # WARNING: Multiple active sessions detected
@@ -146,24 +142,15 @@ bash(find .workflow/active/ -name "WFS-*" -type d 2>/dev/null | head -1 | xargs
 
 ### Step 1: Generate Unique Session Slug
 ```bash
-# Convert to slug
-bash(echo "fix login bug" | sed 's/[^a-zA-Z0-9]/-/g' | tr '[:upper:]' '[:lower:]' | cut -c1-50)
-
-# Check if exists, add counter if needed
-bash(ls .workflow/active/WFS-fix-login-bug 2>/dev/null && echo "WFS-fix-login-bug-2" || echo "WFS-fix-login-bug")
+# Convert description to slug: lowercase, alphanumeric + hyphen, max 50 chars
+# Check if exists via ccw session list, add counter if collision
+ccw session list --location active
 ```
 
 ### Step 2: Create Session Structure
 ```bash
-bash(mkdir -p .workflow/active/WFS-fix-login-bug/.process)
-bash(mkdir -p .workflow/active/WFS-fix-login-bug/.task)
-bash(mkdir -p .workflow/active/WFS-fix-login-bug/.summaries)
-```
-
-### Step 3: Create Metadata
-```bash
-# Include type field from --type parameter (default: "workflow")
-bash(echo '{"session_id":"WFS-fix-login-bug","project":"fix login bug","status":"planning","type":"workflow","created_at":"2024-12-04T08:00:00Z"}' > .workflow/active/WFS-fix-login-bug/workflow-session.json)
+# Single command creates directories (.process, .task, .summaries) + metadata
+ccw session init WFS-fix-login-bug --type workflow --content '{"project":"fix login bug","status":"planning"}'
 ```
 
 **Output**: `SESSION_ID: WFS-fix-login-bug`