[Madraka]

Two follow-ups from RFC-0041 (#95, #97).

1. One field-asset check

• fieldAssetIssues({defs, refs, kept, lookup, skip?}) in @cloudhal/core-ts/media. It takes a lookup function, so it doesn't touch storage.
• The rules: an image field needs an image of this site, rich-text asset: references must exist, and a retired file can't be newly used. The codes and messages are the same as before.
• Used in three places: the store write (planEntryFields), the store's diagnose, and the MCP precheck. The copy in mcp-server is deleted.
• Behaviour change in MCP: it could refuse writes the store accepted (a retired asset already used by the entry under another field). It now matches the store exactly.

2. RFC-0041 §5 in the translation tools

• get_translation_source: source no longer carries fields. A new fields output holds only the localized text and rich-text values to translate, and a new sharedFields output lists the non-localized keys. Glossary matching includes the field values.
• save_translation:
  • It takes a fields input. Non-localized values are refused in precheck with field_not_localized, with paths in details.issues, before anything is written.
  • A new translation in the same site no longer copies field values: localized values fall back to the original's, and shared values are read from it.
  • Language editions, and collections without definitions, still copy as before.
• Studio: the hand-written translation draft copies only localized values.

Tests

• core-ts: the new tests pass on sqlite and D1. Locally the Miniflare DO tail fails with EADDRNOTAVAIL.
• mcp-server: 160/160.
• Studio: 1241/1241.
• Typecheck, size check, the MCP doc check and design lint pass.

Changeset: patch (core-ts, mcp-server).

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