dcdpr / jp / 28017206386

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refactor(conversation): Preserve unknown event kinds for forward compat (#778)

When a newer `jp` writes a conversation event whose `type` tag this
build does not recognize, loading that conversation no longer fails. The
raw JSON is retained verbatim in a new `InternalEvent::Unknown` variant
so it round-trips losslessly on the next save.

Unknown events are completely invisible to event iteration, config
resolution, and LLM providers. They pass through projection unchanged,
inherit the current turn index, and serialize back to exactly the bytes
that were written. A `warn!` log is emitted so the situation is
observable without being fatal.

A new `EventKind::TYPE_TAGS` constant lists every recognized `type` tag.
A debug-only assertion in the deserializer catches any variant added to
`EventKind` that is missing from that list, so the guard stays accurate
as the event schema evolves.

Signed-off-by: Jean Mertz <git@jeanmertz.com>

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