The subagent_start/stop hooks are registered but no-op. The prior comment implied
subagents need no handling because they inherit via contextvars — misleading, since
a delegated child runs on a separate thread with its own session id and trace.
Clarify the real situation: a subagent's model/tool calls are already captured as
their own tel_runs row via the child's run_conversation, so nothing is lost. These
hooks are reserved for recording parent->child lineage (needs a tel_runs.parent_run_id
column), deferred until a consumer needs the delegation tree. Comment-only.
emozilla
81a34156a5