Issue complete.

Generated and reviewed:

- `docs/generated/FEATURES_developer.md`
- `docs/generated/FEATURES_user.md`
- `docs/generated/FEATURES_investor.md`

Quality fix made during review:

- the first investor output invented privacy mode names, so the canonical source and prompts were tightened and the docs were regenerated

Final state:

- canonical source is `KESTREL_FEATURES.md`
- generated audience docs are present and derived from that source
- legacy catalog is archived
- generator prompts no longer hardcode stale metrics
