Sessions started outside T3 (Tern, Hermes app) don't reach T3, and imported ones are empty

Owner reports

2026-10-14: "t3code isn't importing any of my past sessions or live ones from hermes, omp, or claude code". "I care less about history and more about managing live sessions."
2026-10-29: "it still hasn't loaded all the messages from both hosts yet. i wanna be able to edit or resume all convos."
2026-11-02, twice: "the t3code app still isnt pulling live hermes sessions i started in tern or thru the hermes app." "can we create an issue about this upstream?"
2026-11-02: "why does it need to 'sync'… does it duplicate conversation history??"

Layer	Status
Hermes ACP lists only ACP-created sessions	Fixed in kvnloo/hermes-agent#656 (draft). Applied to the live install 2026-11-02.
T3 imports native sessions only through a manual web Settings import; mobile has no import screen	Open. A stopgap timer on groot calls the list/import RPCs every 2 min (20 sessions imported: 17 Tern, 3 Hermes app).
Imported threads show title only, no history (a 262-message Tern session shows 0)	Open. Upstream issue `22015`.
OMP ACP imports are metadata-only and unhydrated	Open. Same as `22015`.
Turns continued outside T3 never reach T3	Open. Upstream `28681`, `21080`, `27524` (observer mode).
Claude history only scanned `~/.claude`, not `~/.claude-home`	Worked around in settings on 10-14.

data/operations/t3code-factory/20261102/ideas-acp-session-sync.md: opt-in auto-import per provider instance, so mobile gets the threads with no new UI.
…/ideas-provider-owned-history.md: the harness owns the transcript and T3 keeps a bounded cache. This answers the "why does it duplicate history" question.

A session started in Tern or the Hermes app appears in T3 on web, desktop and Android without a manual import.
Opening it shows its history.
Turns made outside T3 appear when the thread is reopened.
Ideas posts gated and linked here.