Session replay: turn stepper + transport bar (P1+P2)#9
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Replay is a time cursor over the same session data: pairs whose response completed at or before the cursor are visible, everything after doesn't exist yet. visibleAt() feeds the existing buildSession path, so both panes (wire threads + conversation) rebuild naturally from partial history — exactly the code path that renders mid-capture live sessions today. - src/replay.ts: pure timeline primitives (visibleAt, replayEvents, boundary walkers, anchorAt, nextTick with idle compression), inlined into the page and unit-tested like summarize.ts. - Transport bar in the Session view: play/pause at 1/2/8/60x with idle gaps compressed to <=2s, scrubber-as-minimap (turns tall accent, errors red, probes ticks), drag to scrub, elapsed/total clock. - Keyboard: arrows step turns, shift+arrows step wire requests, Space plays, Home/End jump, Esc exits back to the live tail. - Deep links anchor on pair id (#/session/<key>/@<pair-id>) — pausing updates the URL, opening one starts replay paused at that moment; ids survive cross-run history merges where wall-clock offsets wouldn't. - Live captures keep extending the track; "live" exits and re-attaches the tail. Snapshots replay identically offline. Verified by 12 unit tests plus a stubbed-DOM behavioral smoke driving the page script end-to-end (step/seek/play/deep-link). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Implements P1+P2 of docs/design/session-replay.md — zero capture changes, works on every trace ever captured.
What
src/replay.ts(new, pure, inlined):visibleAt(pairs, cursor)is the whole feature — the wire as of a moment, fed through the existingbuildSessionpath. PlusreplayEvents(response-end boundaries),nextBoundary/prevBoundary/anchorAtwalkers, andnextTick(playback scheduler with ≤2s idle compression).←/→step turns,shift+←/→step wire requests,Spaceplay/pause,Home/End,Escexits. Entering via→starts at the beginning; via←steps back from now.#/session/<key>/@<pair-id>opens paused at that pair; pausing/stepping updates the URL viareplaceState. Anchored on pair id so links survive cross-run history merges.Design-doc open questions resolved: requests list stays full during replay; probes render as minimap ticks. Doc updated (P1+P2 shipped, P3/P4 remain).
Verification
tests/replay.test.ts, replay-machinery guards in the snapshot test)🤖 Generated with Claude Code