feat(plugin): let links and release dates cross the RPC boundary

The link getters and setters and the release date accessors were explicit
errors for every non-empty value, because an immutable value has no entity
to point a handle at. They now cross as materialized values: the descriptor
names the real class and the constructor arguments, and each side builds a
genuine instance of its own.

The semver constraint a link holds is encoded structurally rather than
re-parsed from its string form, so the pretty strings and the conjunctive
flag survive the crossing.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

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