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Brennan Benson
e2c5414f76
* fix(native-chat): an older Orca skips and keeps a journal row of a kind it does not know
* test(native-chat): a newer build's journal row kind survives reads, writes, rewinds and reopens
* fix(native-chat): an older Orca keeps an unknown journal row kind read-only unless its writer declared it skippable
A row of a kind this build does not know, in a well-formed envelope, now latches the chat
read-only with every row kept, the same way a newer row version does. It is read past only
when its writer declared `ifUnknown` on the row: `skip` (a rewind drops it) or `carry` (a
rewind carries it after the rebuilt history, epoch, seq and fence restamped). Every existing
kind changes queue or turn state, so skipping by default would let an older build write from
a wrong fold.
- journal-row-kind-compatibility.ts: each kind states how older builds read it, typed over
every row kind, so a new kind cannot be added without a declaration.
- Rewind restates the Resume and Stop as before, then carries `carry` rows in source order;
the restatement goes back to { lifted, liveStop }.
- Replay treats a row whose body names another sequence than its stored key as malformed at
the key, so the next write never collides with it; catch-up reads stop there too.
* refactor(native-chat): drop the writer opt-in; an unknown journal row kind only latches read-only
An older Orca now treats a row of a kind it does not know exactly like a row from a newer
schema version: every row stays on disk and the chat opens read-only until an update. The
writer-declared skip/carry opt-in, its in-memory placeholder, the carry through rewinds and
the per-kind registry are removed: no current or planned kind could use them, and they can
come with the first kind that may safely be read past.
Kept: an unknown kind needs the envelope every row keeps (epoch, sequence, fence, timestamp),
else it is damage as before; a row whose body names another sequence than its stored key is
malformed at the key; the epoch row's validator names its kind. The schema header states the
rule for adding a kind: keep the envelope, and either ship the reader first or bump `v`.
* refactor(native-chat): derive the journal's known row kinds from the row union
Each kind's own-field check now lives in one table keyed by every kind JournalRow holds, and
the set of kinds this build knows is derived from that table. A kind added to the union without
a check fails to compile, rather than latching this build's own chats read-only as a newer
build's kind. A test reads one valid row of every kind.