* refactor(line): replace nine-marker prompt DSL with typed rich messages
Delete the LINE plugin's double-bracket marker language (quick_replies,
location, confirm, buttons, media_player, event, agenda, device,
appletv_remote) and its parser. Portable interactions now flow through the
existing presentation-block seam (renderPresentation, matching Discord and
Feishu); LINE-specific cards ride closed channelData.line schemas mapped to
the existing Flex renderers. Prompt section shrinks to four capability
lines and explicitly de-fangs marker text. Removes the stale
assertion-safety baseline entry for the deleted parser.
Production LOC net -69, tests net -433. Suite: 510/510 green.
* fix(line): declare rich message schema dependency
* fix(line): satisfy rich message type checks
* docs(line): mark card fragments as partial
Peter Steinberger
d8ebe85c24