opencode persists its own sessions but, unlike the Claude family, will not let
the caller mint the session id up front: `opencode run` creates a session on the
first turn and only reports its id in the `--format json` event stream, then
continues it with `--session <id>`. So the connector now CAPTURES the id from
the output (like codex's thread id) instead of minting a UUID:
- connect_opencode.go: a dedicated opencodeForwarder that runs
`opencode run --pure --format json`, accumulates reply text from `text`
events, captures the top-level sessionID, and on the first turn persists the
convID->sessionID map to <config>/connect/<clientId>/opencode-sessions.json
(best-effort, restored on startup). The next message — and a connector
restart — replays it with `--session <id>`. Implements streamingForwarder and
sessionResetter, so /new and /clear work and streaming cards stream.
- forwarderForChannel routes the opencode channel to it.
- connectAgentOptionsPayload reports opencode memory as
"per-conversation-captured"; --agent-memory help now lists codex/opencode too.
Verified end to end against the real opencode CLI: turn 1 captures the session
id, turn 2 with --session recalls a fact from turn 1. Unit tests cover capture +
resume (stub bin), store persistence across restart, and reset.
gemini also exposes --session-id/--resume but could not be verified end to end
here (no GEMINI_API_KEY) and its --resume id semantics are unconfirmed, so it is
left for a follow-up rather than wired blind. qoder's qodercli still has only
--resume (no addressable id) and cannot do per-conversation memory.