fix: clear 'Plan Ready' on implementation in a new thread

apps/server/src/orchestration/Layers/ProjectionPipeline.ts

@@ -653,6 +653,8 @@ const makeOrchestrationProjectionPipeline = Effect.gen(function* () {
             threadId: event.payload.threadId,
             turnId: event.payload.proposedPlan.turnId,
             planMarkdown: event.payload.proposedPlan.planMarkdown,
+            implementedAt: event.payload.proposedPlan.implementedAt,
+            implementationThreadId: event.payload.proposedPlan.implementationThreadId,
             createdAt: event.payload.proposedPlan.createdAt,
             updatedAt: event.payload.proposedPlan.updatedAt,
           });
@@ -775,11 +777,23 @@ const makeOrchestrationProjectionPipeline = Effect.gen(function* () {
           yield* projectionTurnRepository.replacePendingTurnStart({
             threadId: event.payload.threadId,
             messageId: event.payload.messageId,
+            sourceProposedPlanThreadId: event.payload.sourceProposedPlan?.threadId ?? null,
+            sourceProposedPlanId: event.payload.sourceProposedPlan?.planId ?? null,
             requestedAt: event.payload.createdAt,
           });
           return;
         }
 
+        case "thread.activity-appended": {
+          if (event.payload.activity.kind !== "provider.turn.start.failed") {
+            return;
+          }
+          yield* projectionTurnRepository.deletePendingTurnStartByThreadId({
+            threadId: event.payload.threadId,
+          });
+          return;
+        }
+
         case "thread.session-set": {
           const turnId = event.payload.session.activeTurnId;
           if (turnId === null || event.payload.session.status !== "running") {

apps/server/src/orchestration/Layers/ProjectionSnapshotQuery.test.ts

@@ -26,6 +26,7 @@ projectionSnapshotLayer("ProjectionSnapshotQuery", (it) => {
 
       yield* sql`DELETE FROM projection_projects`;
       yield* sql`DELETE FROM projection_state`;
+      yield* sql`DELETE FROM projection_thread_proposed_plans`;
       yield* sql`DELETE FROM projection_turns`;
 
       yield* sql`
@@ -101,6 +102,29 @@ projectionSnapshotLayer("ProjectionSnapshotQuery", (it) => {
         )
       `;
 
+      yield* sql`
+        INSERT INTO projection_thread_proposed_plans (
+          plan_id,
+          thread_id,
+          turn_id,
+          plan_markdown,
+          implemented_at,
+          implementation_thread_id,
+          created_at,
+          updated_at
+        )
+        VALUES (
+          'plan-1',
+          'thread-1',
+          'turn-1',
+          '# Ship it',
+          '2026-02-24T00:00:05.500Z',
+          'thread-2',
+          '2026-02-24T00:00:05.000Z',
+          '2026-02-24T00:00:05.500Z'
+        )
+      `;
+
       yield* sql`
         INSERT INTO projection_thread_activities (
           activity_id,
@@ -253,7 +277,17 @@ projectionSnapshotLayer("ProjectionSnapshotQuery", (it) => {
               updatedAt: "2026-02-24T00:00:05.000Z",
             },
           ],
-          proposedPlans: [],
+          proposedPlans: [
+            {
+              id: "plan-1",
+              turnId: asTurnId("turn-1"),
+              planMarkdown: "# Ship it",
+              implementedAt: "2026-02-24T00:00:05.500Z",
+              implementationThreadId: ThreadId.makeUnsafe("thread-2"),
+              createdAt: "2026-02-24T00:00:05.000Z",
+              updatedAt: "2026-02-24T00:00:05.500Z",
+            },
+          ],
           activities: [
             {
               id: asEventId("activity-1"),

apps/server/src/orchestration/Layers/ProjectionSnapshotQuery.ts

@@ -200,6 +200,8 @@ const makeProjectionSnapshotQuery = Effect.gen(function* () {
           thread_id AS "threadId",
           turn_id AS "turnId",
           plan_markdown AS "planMarkdown",
+          implemented_at AS "implementedAt",
+          implementation_thread_id AS "implementationThreadId",
           created_at AS "createdAt",
           updated_at AS "updatedAt"
         FROM projection_thread_proposed_plans
@@ -435,6 +437,8 @@ const makeProjectionSnapshotQuery = Effect.gen(function* () {
               id: row.planId,
               turnId: row.turnId,
               planMarkdown: row.planMarkdown,
+              implementedAt: row.implementedAt,
+              implementationThreadId: row.implementationThreadId,
               createdAt: row.createdAt,
               updatedAt: row.updatedAt,
             });