Writes a subagent's transcript to disk so it doesn't bloat the parent's context.
Path: <cwd>/.exathena/sessions/<parent_session_id>/sidechains/<subagent_id>.jsonl.
Each line is a single JSON object: prompt, opts (subset), result
text + termination metadata. The parent only ever sees the final
text via Result.text; the full transcript persists here.
PR5 replaces this inline writer with the ExAthena.Sessions.Store
behaviour and the JSONL store implementation. Until then, this
bare-bones writer keeps PR4 self-contained.
Summary
Functions
Persist a subagent's full transcript. result is whatever
ExAthena.Loop.run/2 returned ({:ok, %Result{}} or
{:error, term}).
Functions
@spec write(map()) :: :ok
Persist a subagent's full transcript. result is whatever
ExAthena.Loop.run/2 returned ({:ok, %Result{}} or
{:error, term}).
Returns :ok. Errors are silently logged; sidechain writes are
best-effort.