1c027e8189
Narration was generic ("Stage X completed. Summarise.") because nothing about
what the stage actually did reached the narrator — the L2 summary is a
placeholder and StageCompletedEvent carries no output. narrate() now reads the
stage's ToolInvocationRequested events from the log and feeds the narrator a
concrete 'Actions taken this stage: file_read(path), ...' entry, and the system
prompt asks it to prefer those concrete actions over restating the stage name.