Proposal: Add review stage to CLAUDE.md project structure

What

Update the project structure tree in CLAUDE.md to include the new 05_review/ stage and renumber done to 06_done/.

Why

The feature lifecycle is gaining a review stage between in-progress and done. CLAUDE.md is the master instruction file and must reflect the current folder structure.

Spec

In the Project Structure section, replace:

│   ├── 10_features/          # Feature lifecycle (01_ideas → 02_new → 03_planned → 04_in-progress → 05_done)
│   │   ├── 01_ideas/          # Vague future ideas (no FR number)
│   │   ├── 02_new/            # New, unprocessed feature requests
│   │   ├── 03_planned/        # Approved and designed
│   │   ├── 04_in-progress/    # Currently being built
│   │   └── 05_done/           # Completed

With:

│   ├── 10_features/          # Feature lifecycle (01_ideas → 02_new → 03_planned → 04_in-progress → 05_review → 06_done)
│   │   ├── 01_ideas/          # Vague future ideas (no FR number)
│   │   ├── 02_new/            # New, unprocessed feature requests
│   │   ├── 03_planned/        # Approved and designed
│   │   ├── 04_in-progress/    # Currently being built
│   │   ├── 05_review/         # Opus finished, awaiting user review
│   │   └── 06_done/           # Completed and verified

Impact

Only CLAUDE.md is affected. This is a documentation-only change to the project structure tree. All sessions will see the updated lifecycle flow.