Updates docs/commands.md to cover the v0.3 surface:
- ctask new --project flag, project mode, project root
semantics, seed order, git init behavior
- ctask list --projects flag and --all/--projects matrix
- Seed directory locations (general + project) and skip rules
- CTASK_TYPE child env var, CTASK_PROJECT_ROOT,
CTASK_SEED_DIR, CTASK_SEED_PROJECT_DIR config vars
- Doctor [INFO] seed directory reporting
No remote install or publish commands are added; the project
remains local-only.