fix(runner): preserve ACPX command attestation

packages/paperclip-runner/src/cli/acpx-runtime-sidecar.ts

@@ -283,7 +283,10 @@ async function dispatch(
       startedAt: new Date().toISOString(),
     });
     return {
-      identity: acpxProviderSessionIdentity(openedHost.identity()),
+      identity: acpxProviderSessionIdentity(
+        openedHost.identity(),
+        openedHost.binding(),
+      ),
       sidecarPid: process.pid,
       status: opened.status,
     };
@@ -398,7 +401,10 @@ async function dispatch(
   if (request.command === "session.read") {
     const activeHost = requireHost();
     return {
-      identity: acpxProviderSessionIdentity(activeHost.identity()),
+      identity: acpxProviderSessionIdentity(
+        activeHost.identity(),
+        activeHost.binding(),
+      ),
       status: sanitizeRuntimeStatus(
         await readSidecarHostStatusWithin(activeHost),
       ),
@@ -407,7 +413,10 @@ async function dispatch(
   if (request.command === "session.snapshot") {
     const activeHost = requireHost();
     return {
-      identity: acpxProviderSessionIdentity(activeHost.identity()),
+      identity: acpxProviderSessionIdentity(
+        activeHost.identity(),
+        activeHost.binding(),
+      ),
       status: sanitizeRuntimeStatus(
         await readSidecarHostStatusWithin(activeHost),
       ),
@@ -426,7 +435,10 @@ async function dispatch(
     // still serialized, and retainActiveHostCleanup keeps admission closed
     // until one sequential close proves ownership was released.
     const activeHost = requireHost({ allowCleanupRetry: true });
-    const identity = acpxProviderSessionIdentity(activeHost.identity());
+    const identity = acpxProviderSessionIdentity(
+      activeHost.identity(),
+      activeHost.binding(),
+    );
     await closeSidecarHostForCommand(
       activeHost,
       boundedOptionalText(request.params.reason, "Paperclip suspension", 4_000),

packages/paperclip-runner/src/drivers/acpx/recovery-identity.test.ts

@@ -42,13 +42,13 @@ describe("ACPX recovery identity", () => {
       normalizedSessionId: "session-1",
       permissionMode: "approve-reads",
     });
-    expect(acpxProviderSessionIdentity(record)).toEqual({
+    expect(acpxProviderSessionIdentity(record, fixture.binding)).toEqual({
       kind: "acpx",
       normalizedSessionId: "session-1",
       acpxRecordId: fixture.expected.acpxRecordId,
       backendSessionId: fixture.expected.backendSessionId,
       agentSessionId: fixture.expected.agentSessionId,
-      profileDigest: fixture.binding.profileDigest,
+      profileDigest: fixture.binding.commandDigest,
       workspaceDigest: fixture.binding.workspaceDigest,
       requestedModel: fixture.binding.requestedModel,
       effectiveModel: fixture.binding.effectiveModel,
@@ -140,7 +140,7 @@ describe("ACPX recovery identity", () => {
         {
           ...fixture.expected,
           normalizedSessionId: otherBinding.normalizedSessionId,
-          profileDigest: otherBinding.profileDigest,
+          profileDigest: otherBinding.commandDigest,
           workspaceDigest: otherBinding.workspaceDigest,
         },
         otherBinding,
@@ -176,17 +176,6 @@ describe("ACPX recovery identity", () => {
     expect(() =>
       verifyExpectedAcpxIdentity(fixture.expected, fixture.binding, earlyV1),
     ).toThrow(/persisted runtime record/);
-    expect(() =>
-      verifyExpectedAcpxIdentity(
-        {
-          ...fixture.expected,
-          profileDigest: fixture.input.profile.commandDigest,
-        },
-        fixture.binding,
-        earlyV1,
-      ),
-    ).toThrow(/immutable session configuration/);
-
     const changedBinding = await createAcpxRecoveryBinding({
       ...fixture.input,
       profile: {
@@ -197,11 +186,12 @@ describe("ACPX recovery identity", () => {
     expect(changedBinding.profileDigest).not.toBe(
       fixture.binding.profileDigest,
     );
+    expect(changedBinding.commandDigest).toBe(fixture.binding.commandDigest);
     expect(() =>
       verifyExpectedAcpxIdentity(
         {
           ...fixture.expected,
-          profileDigest: changedBinding.profileDigest,
+          profileDigest: changedBinding.commandDigest,
         },
         changedBinding,
         earlyV1,
@@ -275,7 +265,7 @@ async function recoveryFixture() {
     acpxRecordId: "record-1",
     backendSessionId: "backend-1",
     agentSessionId: "agent-1",
-    profileDigest: binding.profileDigest,
+    profileDigest: binding.commandDigest,
     workspaceDigest: binding.workspaceDigest,
     requestedModel: binding.requestedModel,
     effectiveModel: binding.effectiveModel,

packages/paperclip-runner/src/drivers/acpx/recovery-identity.ts

@@ -14,6 +14,7 @@ export interface AcpxRecoveryBinding {
   workspacePath: string;
   workspaceDigest: string;
   runtimeRoot: string;
+  commandDigest: string;
   profileDigest: string;
   requestedModel: string;
   effectiveModel: string;
@@ -87,6 +88,7 @@ export async function createAcpxRecoveryBinding(input: {
     workspacePath,
     workspaceDigest,
     runtimeRoot,
+    commandDigest: input.profile.commandDigest,
     profileDigest,
     requestedModel: input.requestedModel,
     effectiveModel: input.requestedModel,
@@ -117,19 +119,25 @@ export function createAcpxIdentityRecord(
 /** Project the private persisted record into the PRP sidecar wire identity. */
 export function acpxProviderSessionIdentity(
   record: AcpxIdentityRecord,
+  binding: AcpxRecoveryBinding,
 ): AcpxExpectedSessionIdentity {
-  return {
+  const identity: AcpxExpectedSessionIdentity = {
     kind: "acpx",
     normalizedSessionId: record.normalizedSessionId,
     acpxRecordId: record.acpxRecordId,
     backendSessionId: record.backendSessionId,
     agentSessionId: record.agentSessionId,
-    profileDigest: record.profileDigest,
+    // The PRP provider contract historically names this field
+    // `profileDigest`, but it attests the qualified executable digest. Keep
+    // the broader immutable-profile digest private in the persisted record.
+    profileDigest: binding.commandDigest,
     workspaceDigest: record.workspaceDigest,
     requestedModel: record.requestedModel,
     effectiveModel: record.effectiveModel,
     permissionMode: record.permissionMode,
   };
+  verifyExpectedAcpxIdentity(identity, binding, record);
+  return identity;
 }
 
 /**
@@ -146,7 +154,7 @@ export function verifyExpectedAcpxIdentity(
   validateExpected(expected);
   if (
     expected.normalizedSessionId !== binding.normalizedSessionId ||
-    expected.profileDigest !== binding.profileDigest ||
+    expected.profileDigest !== binding.commandDigest ||
     expected.workspaceDigest !== binding.workspaceDigest ||
     expected.requestedModel !== binding.requestedModel ||
     expected.effectiveModel !== binding.effectiveModel ||

packages/paperclip-runner/src/drivers/acpx/runtime-host.ts

@@ -448,7 +448,7 @@ export class AcpxRuntimeHost {
         kind: "acpx",
         normalizedSessionId: binding.normalizedSessionId,
         ...runtimeIdentity,
-        profileDigest: binding.profileDigest,
+        profileDigest: binding.commandDigest,
         workspaceDigest: binding.workspaceDigest,
         requestedModel: binding.requestedModel,
         effectiveModel: binding.effectiveModel,