refactor(workflow): remove all .active marker file references and sync documentation

Core Changes (10 files):
- commands: cli/execute.md, memory/docs.md, workflow/review.md, workflow/brainstorm/*.md
- agents: cli-execution-agent.md
- workflows: task-core.md, workflow-architecture.md

Transformations:
- Removed all .active-* marker file operations (touch/rm/find)
- Updated session discovery to directory-based (.workflow/sessions/)
- Updated directory structure examples to show sessions/ subdirectory
- Replaced marker-based state with location-based state

Reference Documentation (57 files):
- Auto-synced via analyze_commands.py script
- Includes all core file changes
- Updated command indexes (all-commands.json, by-category.json, etc.)

Migration complete: 100% .active marker references removed
Session state now determined by directory location only

.claude/workflows/task-core.md

@@ -133,8 +133,8 @@ All task files use this simplified 5-field schema:
 
 ### Active Session Detection
 ```bash
-# Check for active session marker
-active_session=$(ls .workflow/.active-* 2>/dev/null | head -1)
+# Check for active session in sessions directory
+active_session=$(find .workflow/sessions/ -name 'WFS-*' -type d 2>/dev/null | head -1)
 ```
 
 ### Workflow Context Inheritance
@@ -144,10 +144,10 @@ Tasks inherit from:
 3. `IMPL_PLAN.md` - Planning document
 
 ### File Locations
-- **Task JSON**: `.workflow/WFS-[topic]/.task/IMPL-*.json` (uppercase required)
-- **Session State**: `.workflow/WFS-[topic]/workflow-session.json`
-- **Planning Doc**: `.workflow/WFS-[topic]/IMPL_PLAN.md`
-- **Progress**: `.workflow/WFS-[topic]/TODO_LIST.md`
+- **Task JSON**: `.workflow/sessions/WFS-[topic]/.task/IMPL-*.json` (uppercase required)
+- **Session State**: `.workflow/sessions/WFS-[topic]/workflow-session.json`
+- **Planning Doc**: `.workflow/sessions/WFS-[topic]/IMPL_PLAN.md`
+- **Progress**: `.workflow/sessions/WFS-[topic]/TODO_LIST.md`
 
 ## Agent Mapping