feat(engine): replay engine core#50
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Add src/ocpp/replay.zig: a deterministic, timer-free ReplayEngine mirroring the toolkit's replay/engine.ts — step / stepBack / jumpTo / getState / reset over a trace's events, exposing the failures detected at each position, plus current / totalEvents. Pure and headless. Real wall-clock auto-playback needs a timer source the zero-config runner does not expose (spiked), so it is deferred to the runner-eject bucket (#33); speed is carried for that future consumer but the pure engine never acts on it. Part of #44 (the manual-scrub UI transport is the remaining piece).
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What
feat(engine): the pure ReplayEngine core (S4 #44) — deterministic,timer-free replay of a trace's events.
Part of #44. (The manual-scrub UI transport is the remaining piece; this PR is the
parity core it builds on.)
Changes
src/ocpp/replay.zig—ReplayEnginemirroring the toolkit'sreplay/engine.ts:init(events, failures, { speed, start_index });step/stepBack(rewind-two-step-one) /
jumpTo/getState/reset;current(null whenempty — the toolkit's
-1);totalEvents.ReplayEventcarries the failures whoseevent_idsinclude that event.ocpp.zig; CURRENT_STATE updated.Scope (per the spike + your call)
runner exposes no timer/tick effect (its
Commandtype is menu/shortcutcommands, not a TEA effect scheduler).
speedis stored for that futureconsumer; the pure engine stays timer-free and consumer-driven, like the toolkit.
remaining part of feat(engine): replay engine + wall-clock playback #44 and lands next.
Tests
115/115 headless tests pass (
native test -Dplatform=null);native check --strictclean;zig fmtclean. New coverage: forward stepping withfailures-at-position,
stepBacksemantics + start boundary,jumpTorangechecks,
getStateplayed/remaining/complete,reset+start_index/speedseeding, and the empty-trace case.