[Have-Purple]

Two small fixes for 2.x. They touch different code paths and can be split if you'd rather take one.

1. A quiet session is handed over

mode() reads process.argv for "run", but 2.x runs plugins in the background service: opencode run and the TUI are both the same serve --service process, so the plugin cannot tell a headless run from an interactive one. A headless run therefore only folded at the next session start, through the recovery path.

A session quiet for fold.STALE_S (600 s) is now handed over on a timer, matching TE's own recovery rule. TE_OPENCODE_QUIET_MS overrides the window (floor 10 s). Where mode() == "run" can still be detected, the immediate hand-over is unchanged.

2. Side calls follow the session's model

With neither opencode_paid_model nor paid_model set, the plugin ran opencode run with no --model, so TE used the CLI's configured default. That default can be a free model the session has already moved past — the resulting 429s looked like TE being broken while the session was running fine on a paid provider.

The plugin now reports the model from session.step.started as provider/model#variant with each hook. The session state keeps it; the loop guard's judge and the micro-skills proposer use it when no paid_model is set. An explicit paid_model still wins, and other hosts keep their own defaults (Claude's haiku) — the fallback is opencode-only.

Design notes

• Both defaults are opinions, not requirements. The 600 s window mirrors fold.STALE_S; the model fallback changes cost semantics. Both can be gated behind config, or this PR can be split, if that fits the project better.
• The POSIX launchers keep their exec bits (100755), so the 1.x/sh path is untouched.

Tests

• a quiet session ends with end_reason == "idle" after the window, while the process is still up;
• the plugin reports the model from session.step.started with its hooks (end-to-end under opencode's runtime);
• the model the plugin sends is kept in the session state;
• side-call precedence: opencode follows the session model, an explicit paid_model wins, Claude stays haiku;
• the judge and a fold both pass the model through.

Verification

opencode 2.3.0, Python 3.15, Windows. The full offline suite is green locally. I could not reproduce CI's opencode 2.2.5 matrix here, so that run is the one thing I'd watch on the PR.

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