Kanban/background completion wakes persist as role=user rows typed with
display_kind="internal_notification" (the synthetic-wake path in run.py).
The model-payload builder already strips display_kind before the request
and is_user_originated_turn already ignores it, but two compaction scans
still treated those rows as real user turns:
- _is_actionable_user_turn (tail anchor) only checked role/content, so a
notification became the protected 'last user turn' the compressor keeps.
- _derive_auto_focus_topic only skipped synthetic compression turns, so
operational notices leaked into the compact focus hint.
Both now exclude display_kind-typed rows, mirroring the existing
is_user_originated_turn exclusion. No schema change; cache- and
role-alternation-safe.
Behavior-contract tests feed 1,000 operational notifications around one
human turn and assert they never anchor the tail, become the auto-focus
source, or count as actionable user turns.
Fixes#92703
lesseradmin