refactor(workflow): complete migration from .workflow/sessions/ to .workflow/active/ directory structure

Update all command files to use the new standardized directory structure:
- Active sessions: .workflow/active/WFS-{session}/
- Archived sessions: .workflow/archives/WFS-{session}/

Changes:
- Updated workflow-architecture.md with new directory structure (active/ not sessions/)
- Fixed 31 path references across 12 command files
- Verified compliance across all 73 command files using parallel agent checks
- Confirmed directory naming: active/ (adjective, no plural) + archives/ (noun plural)

Files modified:
- .claude/workflows/workflow-architecture.md (directory structure definition)
- .claude/commands/cli/*.md (8 files: analyze, chat, codex-execute, discuss-plan, execute, mode/*)
- .claude/commands/memory/docs.md (4 path fixes)
- .claude/commands/task/*.md (execute, replan)

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

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

.claude/commands/task/execute.md

@@ -199,10 +199,10 @@ This is the simplified data structure loaded to provide context for task executi
     "session": "WFS-user-auth",
     "phase": "IMPLEMENT",
     "session_context": {
-      "workflow_directory": ".workflow/WFS-user-auth/",
-      "todo_list_location": ".workflow/WFS-user-auth/TODO_LIST.md",
-      "summaries_directory": ".workflow/WFS-user-auth/.summaries/",
-      "task_json_location": ".workflow/WFS-user-auth/.task/"
+      "workflow_directory": ".workflow/active/WFS-user-auth/",
+      "todo_list_location": ".workflow/active/WFS-user-auth/TODO_LIST.md",
+      "summaries_directory": ".workflow/active/WFS-user-auth/.summaries/",
+      "task_json_location": ".workflow/active/WFS-user-auth/.task/"
     }
   },
   "execution": {