Chat only ever lived in SQLite's `exchanges` table (what was *said*); tool
calls were transient — logged to the in-memory ring buffer and gone at
end-of-turn. This adds a persistent record of what Lyra *did* and exports the
two merged into one transcript.
- memory: new `tool_events` table + `add_tool_event`/`tool_events` accessors;
`delete_session` cascades to it.
- chat: persist each tool call (name/args/result) right where it fires, in both
the non-stream and stream paths. Move the user `remember` to just after
assembly so its timestamp precedes mid-turn tool events — keeps the export in
true chronological order (and records when the message actually arrived).
- transcript: new module renders a session as Markdown (Brian/Lyra speech with
⚙ tool-call lines interleaved) or JSON (machine-readable event stream).
- server: GET /sessions/{id}/export?format=md|json (attachment download).
- ui: ⬇ Export button by the session selector (Markdown or JSON).
Doubles as the receipt for "did the tool actually fire?" — the thing that was
invisible when she'd reply about a hand without logging it.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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