feat(opencode): turn lifecycle events (Turn.Started, Turn.Ended) - #81
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Adds `SessionEvent.Turn.Started` and `SessionEvent.Turn.Ended` (live events, types `session.next.turn.started`/`session.next.turn.ended`) carrying `{ sessionID, timestamp }` (+ `finished` on Ended). Fires `Turn.Started` once per turn at the top of `runLoop` and `Turn.Ended` once when the loop exits.
First two events of the agent-loop decomposition. They mark the natural lifecycle boundary of a turn (a user prompt may span multiple steps) and give V2 plugins / telemetry a clean entry/exit point without depending on the internal `while (true)` structure. Same shim pattern as the rest: V2 surface alongside the existing V1 flow, no breaking change.
Next decomposition steps (separate PRs): `Step.Started`/`Step.Ended` per-step events, `LLM.Stream` already wired in schema, `Tools.Execute` event around the per-tool pipeline, and finally the per-step services replaceable via the plugin runtime.
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First two events of the agent-loop decomposition. Adds
SessionEvent.Turn.StartedandSessionEvent.Turn.Ended(live events) and fires them around therunLoopinpackages/opencode/src/session/prompt.ts.What this PR does
Turn.Started/Turn.Endedto the schema (live, non-durable).Turn.Startedfires once at the top ofrunLoop, before any step runs.Turn.Endedfires once when the loop exits (after the finalbreak), before the prune fork.Why this matters
A turn is the natural boundary of agent work (one user prompt may span multiple steps). Marking it explicitly gives V2 plugins / telemetry a clean entry/exit point without depending on the internal
while (true)structure. dsh usesturn/startandturn/endingfor the same reason.Pattern
Same as the rest: V2 surface alongside the existing V1 flow, no breaking change. V2 plugins can subscribe via
events.subscribe/events.subscribeAllwithout registering a V1 plugin.Out of scope (next steps in the decomposition)
Step.Started/Step.Endedper-step events (already in schema, just need wiring)LLM.Streamevent around the AI-SDK callTools.Executeevent wrapping the per-tool pipelineNeed help on this PR? Tag
@codesmith-botwith what you need. Autofix is disabled.