Sync MCP source from the monorepo (def6f27)

[github-actions]

Published by release/2026-09-20-003 from monorepo commit def6f2765677fe15e042edefb65b4ab0e257a34e.

Previous sync: 7ee9a90ba1c844bacebe1159f2b3228a7c488f6a.

src/host/ is this copy own and is not touched.

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[agoldis]

Closing as superseded by #199, which syncs monorepo commit d882151. This PR's source commit is an ancestor of d882151, and a sync applies the whole shared tree with rsync --delete rather than a diff, so #199 carries everything here.

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