## Why
Skill catalog rendering can shorten descriptions or omit enabled skills to fit
the model context budget. Surface these reductions so users know when the
model-visible catalog has lost detail.
## What changed
- Emit a warning with the omitted skill count whenever entries do not fit.
- Warn when description shortening averages more than 100 characters per skill.
- Deduplicate executor catalog warnings across repeated world-state builds in a
turn.
## Testing
- Cover the description-shortening threshold and omission warning text.
- Verify warnings through extension and production-turn catalogs, including
per-turn deduplication.
GitOrigin-RevId: bd7fc3482e5dfd8c79072f772a2f54aa502478d9
2c92af09cf