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/cli/execute.md

@@ -76,8 +76,8 @@ Use `resume --last` when current task extends/relates to previous execution. See
 
 ## Workflow Integration
 
-**Session Management**: Auto-detects `.workflow/.active-*` marker
-- Active session: Save to `.workflow/WFS-[id]/.chat/execute-[timestamp].md`
+**Session Management**: Auto-detects active session from `.workflow/sessions/` directory
+- Active session: Save to `.workflow/sessions/WFS-[id]/.chat/execute-[timestamp].md`
 - No session: Create new session or save to scratchpad
 
 **Task Integration**: Load from `.task/[TASK-ID].json`, update status, generate summary