content[] field completeness and tightened tool descriptions
Every met_get_object and met_search_collections output field now renders in content[]; all three tools moved to descriptive voice.
Changed:
- Tool and field descriptions across all three tools moved to descriptive voice — dropped imperative coaching and internal mechanics (#8).
- Corrected stale claims: met_list_departments "fetched live on each call" and docs/design.md "no pagination on search results".
Fixed:
- met_get_object format() renders every field with an em-dash placeholder for empty/null/false values, and "Failed fetches: none" for an empty batch (#10).
- met_search_collections marks a non-truncated page (complete).
35 tests pass; bun run devcheck clean.