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/cli/execute.md

@@ -127,8 +127,8 @@ Task(
        - Ensure working implementation with proper error handling
 
     5. Output & Documentation:
-       - Save execution log: .workflow/WFS-[id]/.chat/execute-[timestamp].md
-       ${task_id ? '- Generate task summary: .workflow/WFS-[id]/.summaries/' + task_id + '-summary.md' : ''}
+       - Save execution log: .workflow/active/WFS-[id]/.chat/execute-[timestamp].md
+       ${task_id ? '- Generate task summary: .workflow/active/WFS-[id]/.summaries/' + task_id + '-summary.md' : ''}
        ${task_id ? '- Update task status in .task/' + task_id + '.json' : ''}
        - Document all code changes made
 
@@ -137,7 +137,7 @@ Task(
 )
 ```
 
-**Output**: `.workflow/WFS-[id]/.chat/execute-[timestamp].md` + `.summaries/[TASK-ID]-summary.md` (or `.scratchpad/` if no session)
+**Output**: `.workflow/active/WFS-[id]/.chat/execute-[timestamp].md` + `.workflow/active/WFS-[id]/.summaries/[TASK-ID]-summary.md` (or `.scratchpad/` if no session)
 
 ## Examples