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

Replace legacy bash/jq operations with ccw session commands for better
consistency and maintainability across workflow commands and agents.

Changes:
- commands/memory/docs.md: Use ccw session update/read for session ops
- commands/workflow/review.md: Replace cat/jq with ccw session read
- commands/workflow/tdd-verify.md: Replace find/jq with ccw session read
- agents/conceptual-planning-agent.md: Use ccw session read for metadata
- agents/test-fix-agent.md: Use ccw session read for context package
- skills/command-guide/reference/*: Mirror changes to skill docs
- ccw/src/commands/session.js: Fix EPIPE error when piping to jq/head

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

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

.claude/skills/command-guide/reference/commands/workflow/execute.md

@@ -115,7 +115,7 @@ List sessions with metadata and prompt user selection:
 ```bash
 bash(for dir in .workflow/active/WFS-*/; do
   session=$(basename "$dir")
-  project=$(jq -r '.project // "Unknown"' "$dir/workflow-session.json" 2>/dev/null)
+  project=$(ccw session read "$session" --type session --raw 2>/dev/null | jq -r '.project // "Unknown"')
   total=$(grep -c "^- \[" "$dir/TODO_LIST.md" 2>/dev/null || echo "0")
   completed=$(grep -c "^- \[x\]" "$dir/TODO_LIST.md" 2>/dev/null || echo "0")
   [ "$total" -gt 0 ] && progress=$((completed * 100 / total)) || progress=0
@@ -152,7 +152,7 @@ Parse user input (supports: number "1", full ID "WFS-auth-system", or partial "a
 
 #### Step 1.3: Load Session Metadata
 ```bash
-bash(cat .workflow/active/${sessionId}/workflow-session.json)
+ccw session read ${sessionId} --type session
 ```
 
 **Output**: Store session metadata in memory