Keep version in ddtags and drop snapshot build identity

Preserve the build-version defaulting flow while removing the
applicationId-based snapshot build payload and docs/tests that described
that unshipped resolution path. This keeps browser snapshots keyed by
service plus version without introducing a separate structured build
identity.

Made-with: Cursor

Author: watson

packages/debugger/README.md

@@ -24,8 +24,6 @@ When you also use the Datadog Live Debugger build plugin, `init().version` defau
 
 If provided, `version` should be set to the immutable deployed browser build identifier used for source map upload and browser build resolution. If omitted, debugger delivery and snapshots still work, but browser build lookup and source-aware resolution may be unavailable.
 
-> **Prerequisites for source-code resolution.** The `applicationId` passed to `init()` must correspond to a [RUM application](https://docs.datadoghq.com/real_user_monitoring/browser) with a `service` tag configured. The backend uses this to map `applicationId + version` to the repository URL and commit SHA uploaded with your sourcemaps. If the RUM application is missing or has no `service` tag, source-code resolution will gracefully degrade.
-
 If [Datadog RUM][3] is also initialized on the page, debugger snapshots automatically include RUM context (session, view, user action) without any additional configuration.
 
 ## Troubleshooting

packages/debugger/src/domain/api.spec.ts

@@ -321,36 +321,6 @@ describe('api', () => {
       expect(snapshot.duration).toBeGreaterThanOrEqual(10000000) // Should be in nanoseconds (>= 10ms)
     })
 
-    it('should include build identity inside the snapshot payload', () => {
-      initDebuggerTransport(
-        { service: 'test-service', env: 'test-env', applicationId: 'app-123', version: '1.2.3' } as any,
-        { add: mockBatchAdd } as any
-      )
-
-      const probe: Probe = {
-        id: 'test-probe',
-        version: 0,
-        type: 'LOG_PROBE',
-        where: { typeName: 'TestClass', methodName: 'appIdTest' },
-        template: 'Test',
-        captureSnapshot: false,
-        capture: {},
-        sampling: { snapshotsPerSecond: 5000 },
-        evaluateAt: 'ENTRY',
-      }
-      addProbe(probe)
-
-      const probes = getProbes('TestClass;appIdTest')!
-      onEntry(probes, {}, {})
-      onReturn(probes, null, {}, {}, {})
-
-      const payload = mockBatchAdd.calls.mostRecent().args[0]
-      expect(payload.debugger.snapshot.build).toEqual({
-        applicationId: 'app-123',
-        version: '1.2.3',
-      })
-    })
-
     it('should omit trace correlation when no active span context is available', () => {
       const probe: Probe = {
         id: 'test-probe',

packages/debugger/src/domain/api.ts

@@ -276,10 +276,6 @@ function sendDebuggerSnapshot(probe: InitializedProbe, result: ActiveEntry): voi
             return: result.return,
           }
         : undefined,
-    build: {
-      applicationId: debuggerConfig.applicationId,
-      version: debuggerConfig.version,
-    },
   }
 
   const debuggerApi = globalObj.DD_DEBUGGER!

packages/debugger/src/entries/main.spec.ts

@@ -46,7 +46,6 @@ describe('datadogDebugger', () => {
     const startDeliveryApiPollingSpy = replaceMockableWithSpy(startDeliveryApiPolling)
 
     datadogDebugger.init({
-      applicationId: 'app-id',
       clientToken: 'client-token',
       service: 'service-name',
       env: 'staging',
@@ -79,7 +78,6 @@ describe('datadogDebugger', () => {
     const warnSpy = spyOn(display, 'warn')
 
     datadogDebugger.init({
-      applicationId: 'app-id',
       clientToken: 'client-token',
       service: 'service-name',
       env: 'staging',