feat(FN-5175): thread soft-delete audit context and add reconciliation scri

Adds a reconcile script to recover leaked soft-deleted tasks, threads delete audit context through all callers, and records soft-delete audit events with archive column tracking across core/engine/cli/dashboard, with reliability backstop tests covering caller alignment.

Fusion-Task-Id: FN-5175

packages/cli/src/commands/__tests__/task.test.ts

@@ -1154,7 +1154,12 @@ describe("project-aware task command behavior", () => {
     await runTaskDelete("FN-123", true, "demo-project");
 
     expect(getTask).toHaveBeenCalledWith("FN-123");
-    expect(deleteTask).toHaveBeenCalledWith("FN-123");
+    expect(deleteTask).toHaveBeenCalledWith("FN-123", expect.objectContaining({
+      auditContext: expect.objectContaining({
+        agentId: "cli",
+        runId: expect.stringMatching(/^synthetic-cli-delete-FN-123-/),
+      }),
+    }));
   });
 
   it("runTaskComment, runTaskComments, and runTaskSteer use resolved project store", async () => {
@@ -2224,7 +2229,12 @@ describe("runTaskDelete", () => {
     expect(mockGetTask).toHaveBeenCalledWith("FN-001");
     expect(mockRlQuestion).not.toHaveBeenCalled();
     expect(mockDeleteTask).toHaveBeenCalledOnce();
-    expect(mockDeleteTask).toHaveBeenCalledWith("FN-001");
+    expect(mockDeleteTask).toHaveBeenCalledWith("FN-001", expect.objectContaining({
+      auditContext: expect.objectContaining({
+        agentId: "cli",
+        runId: expect.stringMatching(/^synthetic-cli-delete-FN-001-/),
+      }),
+    }));
 
     const successLine = logSpy.mock.calls.find(
       (call) => typeof call[0] === "string" && call[0].includes("✓ Deleted"),
@@ -2242,7 +2252,12 @@ describe("runTaskDelete", () => {
     expect(mockRlQuestion).toHaveBeenCalledWith("Are you sure you want to delete FN-001? [y/N] ");
     expect(mockRlClose).toHaveBeenCalled();
     expect(mockDeleteTask).toHaveBeenCalledOnce();
-    expect(mockDeleteTask).toHaveBeenCalledWith("FN-001");
+    expect(mockDeleteTask).toHaveBeenCalledWith("FN-001", expect.objectContaining({
+      auditContext: expect.objectContaining({
+        agentId: "cli",
+        runId: expect.stringMatching(/^synthetic-cli-delete-FN-001-/),
+      }),
+    }));
 
     const successLine = logSpy.mock.calls.find(
       (call) => typeof call[0] === "string" && call[0].includes("✓ Deleted"),

packages/cli/src/commands/task.ts

@@ -1207,7 +1207,12 @@ export async function runTaskDelete(id: string, force?: boolean, projectName?: s
   }
 
   try {
-    await store.deleteTask(id);
+    await store.deleteTask(id, {
+      auditContext: {
+        agentId: "cli",
+        runId: `synthetic-cli-delete-${id}-${Date.now()}`,
+      },
+    });
     console.log();
     console.log(`  ✓ Deleted ${id}`);
     console.log();

packages/cli/src/extension.ts

@@ -1179,7 +1179,12 @@ export default function kbExtension(pi: ExtensionAPI) {
 
     async execute(_toolCallId, params, _signal, _onUpdate, ctx) {
       const store = await getStore(ctx.cwd);
-      const task = await store.deleteTask(params.id);
+      const task = await store.deleteTask(params.id, {
+        auditContext: {
+          agentId: "pi-extension",
+          runId: `synthetic-pi-delete-${params.id}-${Date.now()}`,
+        },
+      });
 
       return {
         content: [{ type: "text", text: `Deleted ${task.id}` }],