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/skills/command-guide/reference/commands/workflow/test-cycle-execute.md

@@ -543,7 +543,7 @@ This package is passed to agents via the Task tool's prompt context.
     "coverage_target": 80
   },
   "session": {
-    "workflow_dir": ".workflow/WFS-test-{session}/",
+    "workflow_dir": ".workflow/sessions/WFS-test-{session}/",
     "iteration_state_file": ".process/iteration-state.json",
     "test_results_file": ".process/test-results.json",
     "fix_history_file": ".process/fix-history.json"
@@ -555,7 +555,7 @@ This package is passed to agents via the Task tool's prompt context.
 
 ### Test-Fix Session Files
 ```
-.workflow/WFS-test-{session}/
+.workflow/sessions/WFS-test-{session}/
 ├── workflow-session.json          # Session metadata with workflow_type
 ├── IMPL_PLAN.md                   # Test plan
 ├── TODO_LIST.md                   # Progress tracking