* feat(plugins): support additional upstream session kinds
* feat(acpx): monitor upstream Pi sessions
* feat(opencode): monitor upstream OpenCode sessions
* fix(opencode): ignore hidden user text activity
* refactor(plugins): share upstream echo filtering
* fix(opencode): preserve marker tuple narrowing
* refactor(opencode): detect upstream turns via event_sequence cursor
Replace timestamp/grace-window completeness heuristics with OpenCode's own
per-session event_sequence.seq cursor, which advances inside the same
transaction as the message/part projections. Detects change instead of
inferring completion, so staged part writes can no longer drop a turn.
Handles cursor regression from OpenCode migrations that clear event_sequence,
suppresses compaction replay and summary re-publish, and restricts human-turn
classification to visible non-synthetic text.
* docs(plugins): record why the adoption coordinator requires complete
* fix(opencode): align cursor proof with strict types
* fix(acpx): keep Pi JSON parser private
