fix: restore V3 HTTP observability

Project one typed HttpExecutionObservation per logical V3 execution through a
closed composition-root projector: only registered diagnostic context keys and
bucketed values reach the sinks, and terminal non-abort failures now emit
exactly one api.request.failed telemetry event. Caller cancellation and scope
fencing record a diagnostic but never a failure event.

routeId becomes a required input at the installed operation-executor boundary
so the feature gateway's low-cardinality route identity survives to the sink.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

tests/unit/http-execution-v3.test.ts

@@ -10,6 +10,8 @@ import {
 const installed: InstalledHttpContract<unknown, unknown, unknown> =
   TEST_LIST_HTTP_CONTRACT;
 
+const ROUTE_ID = "TEST_ROUTE";
+
 const scope = Object.freeze({
   generation: 1,
   fingerprint: "scope-1",
@@ -82,7 +84,7 @@ describe("descriptor-driven HTTP execution lifetime", () => {
     });
 
     await expect(
-      executor.execute(installed, { limit: 20 }, { scope }),
+      executor.execute(installed, { limit: 20 }, { routeId: ROUTE_ID, scope }),
     ).resolves.toMatchObject({
       kind: "RATE_LIMITED",
       effect: "NOT_APPLICABLE",
@@ -119,7 +121,7 @@ describe("descriptor-driven HTTP execution lifetime", () => {
         executor.execute(
           createInstalled,
           { name: "created" },
-          { scope, ...(intent === undefined ? {} : { intent }) },
+          { routeId: ROUTE_ID, scope, ...(intent === undefined ? {} : { intent }) },
         ),
       ).resolves.toMatchObject({
         kind: "CONTRACT_VIOLATION",
@@ -154,7 +156,7 @@ describe("descriptor-driven HTTP execution lifetime", () => {
       });
 
       await expect(
-        executor.execute(installed, { limit: 20 }, { scope, intent }),
+        executor.execute(installed, { limit: 20 }, { routeId: ROUTE_ID, scope, intent }),
       ).resolves.toMatchObject({
         kind: "CONTRACT_VIOLATION",
         violation: {
@@ -173,14 +175,14 @@ describe("descriptor-driven HTTP execution lifetime", () => {
       label: "query with the canonical reserved header",
       operation: installed,
       input: { limit: 20 },
-      context: { scope },
+      context: { routeId: ROUTE_ID, scope },
       headerName: "Idempotency-Key",
     },
     {
       label: "valid KEYED command with a case-variant reserved header",
       operation: createInstalled,
       input: { name: "created" },
-      context: { scope, intent: mutationIntent() },
+      context: { routeId: ROUTE_ID, scope, intent: mutationIntent() },
       headerName: "iDeMpOtEnCy-KeY",
     },
   ])(
@@ -252,7 +254,7 @@ describe("descriptor-driven HTTP execution lifetime", () => {
       executor.execute(
         retryingCreate,
         { name: "created" },
-        { scope, intent: mutationIntent({ idempotencyKey: "logical-key" }) },
+        { routeId: ROUTE_ID, scope, intent: mutationIntent({ idempotencyKey: "logical-key" }) },
       ),
     ).resolves.toMatchObject({ kind: "SUCCESS" });
     expect(fetcher).toHaveBeenCalledTimes(2);
@@ -284,7 +286,7 @@ describe("descriptor-driven HTTP execution lifetime", () => {
       executor.execute(
         installed,
         { limit: 20 },
-        { scope },
+        { routeId: ROUTE_ID, scope },
       ),
     ).resolves.toMatchObject({ kind: "SUCCESS" });
     expect(fetcher).toHaveBeenCalledOnce();
@@ -317,6 +319,7 @@ describe("descriptor-driven HTTP execution lifetime", () => {
         createInstalled,
         { name: "created" },
         {
+          routeId: ROUTE_ID,
           scope,
           intent: Object.freeze({
             intentId: "private-intent-id",
@@ -353,7 +356,7 @@ describe("descriptor-driven HTTP execution lifetime", () => {
       fetcher,
     });
 
-    await expect(executor.execute(installed, input, { scope })).resolves.toMatchObject({
+    await expect(executor.execute(installed, input, { routeId: ROUTE_ID, scope })).resolves.toMatchObject({
       kind: "SUCCESS",
     });
     expect(String((fetcher.mock.calls as unknown[][])[0]?.[0])).toContain(
@@ -389,11 +392,11 @@ describe("descriptor-driven HTTP execution lifetime", () => {
       },
     } as unknown as typeof installed;
 
-    await expect(executor.execute(throwing, { limit: 20 }, { scope })).resolves.toMatchObject({
+    await expect(executor.execute(throwing, { limit: 20 }, { routeId: ROUTE_ID, scope })).resolves.toMatchObject({
       kind: "CONTRACT_VIOLATION",
       effect: "NOT_APPLICABLE",
     });
-    await expect(executor.execute(malformed, { limit: 20 }, { scope })).resolves.toMatchObject({
+    await expect(executor.execute(malformed, { limit: 20 }, { routeId: ROUTE_ID, scope })).resolves.toMatchObject({
       kind: "CONTRACT_VIOLATION",
       effect: "NOT_APPLICABLE",
     });
@@ -416,6 +419,7 @@ describe("descriptor-driven HTTP execution lifetime", () => {
         createInstalled,
         { name: "created" },
         {
+          routeId: ROUTE_ID,
           scope,
           intent: mutationIntent(),
         },
@@ -458,6 +462,7 @@ describe("descriptor-driven HTTP execution lifetime", () => {
         createInstalled,
         { name: "created" },
         {
+          routeId: ROUTE_ID,
           scope: fencedScope,
           intent: mutationIntent({ intentId: "intent-2", idempotencyKey: "key-2" }),
         },
@@ -479,7 +484,7 @@ describe("descriptor-driven HTTP execution lifetime", () => {
     });
 
     const result = executor
-      .execute(operation({ deadlineMs: 5 }), { limit: 20 }, { scope })
+      .execute(operation({ deadlineMs: 5 }), { limit: 20 }, { routeId: ROUTE_ID, scope })
       .then((outcome) => {
         settled = true;
         return outcome;
@@ -532,7 +537,7 @@ describe("descriptor-driven HTTP execution lifetime", () => {
         const result = executor.execute(
           operation({ deadlineMs: 5 }),
           { limit: 20 },
-          { scope },
+          { routeId: ROUTE_ID, scope },
         );
         await vi.advanceTimersByTimeAsync(5);
         await flushMicrotasks();
@@ -548,7 +553,14 @@ describe("descriptor-driven HTTP execution lifetime", () => {
       expect(observe).toHaveBeenCalledTimes(iterationCount);
       for (const [observation] of observe.mock.calls) {
         expect(observation).toEqual(
-          expect.objectContaining({ attempts: 1, certainty: "TIMEOUT" }),
+          expect.objectContaining({
+            attemptCount: 1,
+            errorKind: "TIMEOUT",
+            terminalReason: "TIMEOUT",
+            cancellationOwner: "DEADLINE",
+            routeId: ROUTE_ID,
+            operationId: "TEST_LIST_ENTITIES",
+          }),
         );
       }
     } finally {
@@ -582,7 +594,7 @@ describe("descriptor-driven HTTP execution lifetime", () => {
     });
 
     const result = executor
-      .execute(installed, { limit: 20 }, { scope, signal: caller.signal })
+      .execute(installed, { limit: 20 }, { routeId: ROUTE_ID, scope, signal: caller.signal })
       .then((outcome) => {
         settled = true;
         return outcome;
@@ -617,7 +629,7 @@ describe("descriptor-driven HTTP execution lifetime", () => {
       executor.execute(
         operation({ responseBody: "NONE" }),
         { limit: 20 },
-        { scope },
+        { routeId: ROUTE_ID, scope },
       ),
     ).resolves.toMatchObject({
       kind: "TRANSPORT_FAILURE",