feat(l9-inspector): full envelope JSON + history backfill + readability - #524
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Each FrameRow in the L9 inspector now toggles open on click to reveal the raw wire message pretty-printed below the summary line. toL9Frame retains the source message on the frame, and envelopeJson decodes the transport- encoded content string so headers, payload data, and parents read as structure. While any row is expanded the feed pauses tail-following so incoming frames don't yank the open envelope out of view. Closes #501 Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01HTpkAUFrPVH8gz6ZUjvgQA
The live L9 inspector was fed only by the SSE bus (no history), so a freshly
opened tab started empty and any earlier traffic was invisible. Backfill it
from the durable transcript, mirroring the room chat's history-then-live design.
Backend: extract the bus-frame builder into l9_bus_frame(), add
l9_wire_history() replaying the transcript through that same shape (envelope
intact — the conversational messages API flattens it to text and drops
non-chat records), exposed as GET /rooms/{room}/messages/l9.
Frontend: fetchL9History() seeds the inspector on mount, then live SSE appends
with an id-dedup set so a backfilled row and its live re-push don't double up.
Also polish the expanded envelope: max-height scroll, dependency-free JSON
syntax highlight, and a hover + rotating-chevron affordance so rows read as
clickable.
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Closes #501. Live-verified against a running SLIM node using the
mycelium l9 sendutility from #534.What
The L9 Inspector was hard to use: rows didn't expand to the underlying envelope, and the feed was live-only — a freshly opened tab started empty and any earlier traffic was gone. This makes it a real inspector.
{header, payload}envelope.Backend
persister.l9_bus_frame()(shared by_publish_to_bus), addl9_wire_history()replaying the transcript through that same shape, exposed asGET /rooms/{room}/messages/l9. This preserves the full L9 envelope — the conversational messages API flattens records to text and drops non-chat payloads, so it could never feed the inspector.tests/test_l9_history.py: envelope-intact replay, oldest-first + limit, empty room.Frontend
fetchL9History()seedsframeson mount; live SSE appends with a sharedseenIdsset so a backfilled row and its live re-push (same envelope id) don't double up.highlightJson()— small tokenizer (keys/strings/numbers/literals), visible text byte-identical.<pre>:max-h-64 overflow-auto; rows gethover:bg-hairline+ a leading chevron that rotates on expand.