Advance M8-M11 parity workflows

web/app/src/sequencer/SequencerMediaRevisionGate.ts

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+import {
+  SEQUENCER_MEDIA_REVISION_SCHEMA,
+  gateSequencerMediaRevision,
+  parseSequencerMediaRevisionRequest,
+  parseSequencerMediaRevisionState,
+  SequencerMediaRevisionValidationError,
+  type SequencerMediaOperation,
+  type SequencerMediaRevisionDecisionIR,
+  type SequencerMediaRevisionRequestIR,
+  type SequencerMediaRevisionResultIR,
+  type SequencerMediaRevisionStateIR,
+} from "../../../protocol/sequencer-media-revision";
+
+export class SequencerMediaRevisionGate {
+  private stateValue: SequencerMediaRevisionStateIR;
+
+  constructor(timelineId: string, timelineRevision: number) {
+    this.stateValue = parseSequencerMediaRevisionState({
+      schemaVersion: SEQUENCER_MEDIA_REVISION_SCHEMA,
+      timelineId,
+      timelineRevision,
+      latestRequestRevision: 0,
+    });
+  }
+
+  state(): SequencerMediaRevisionStateIR {
+    return { ...this.stateValue };
+  }
+
+  begin(operation: SequencerMediaOperation, frame: number): SequencerMediaRevisionRequestIR {
+    this.stateValue = {
+      ...this.stateValue,
+      latestRequestRevision: this.stateValue.latestRequestRevision + 1,
+    };
+    return parseSequencerMediaRevisionRequest({
+      schemaVersion: SEQUENCER_MEDIA_REVISION_SCHEMA,
+      requestId: `media:${this.stateValue.latestRequestRevision}`,
+      timelineId: this.stateValue.timelineId,
+      timelineRevision: this.stateValue.timelineRevision,
+      requestRevision: this.stateValue.latestRequestRevision,
+      operation,
+      frame,
+    });
+  }
+
+  replaceTimeline(timelineId: string, timelineRevision: number): SequencerMediaRevisionStateIR {
+    if (timelineId === this.stateValue.timelineId && timelineRevision <= this.stateValue.timelineRevision) {
+      throw new SequencerMediaRevisionValidationError("REVISION_CONFLICT", "Sequencer timeline revision must advance monotonically");
+    }
+    this.stateValue = parseSequencerMediaRevisionState({
+      schemaVersion: SEQUENCER_MEDIA_REVISION_SCHEMA,
+      timelineId,
+      timelineRevision,
+      latestRequestRevision: this.stateValue.latestRequestRevision + 1,
+    });
+    return this.state();
+  }
+
+  resolve(
+    request: SequencerMediaRevisionRequestIR,
+    result: SequencerMediaRevisionResultIR,
+    publish: (result: SequencerMediaRevisionResultIR) => void,
+  ): SequencerMediaRevisionDecisionIR {
+    const decision = gateSequencerMediaRevision(request, this.stateValue, result);
+    if (decision.status === "PUBLISH") publish(result);
+    return decision;
+  }
+}
+
+export type {
+  SequencerMediaOperation,
+  SequencerMediaRevisionDecisionIR,
+  SequencerMediaRevisionRequestIR,
+  SequencerMediaRevisionResultIR,
+  SequencerMediaRevisionStateIR,
+};