Move browser-build identity from ddtags to snapshot payload

Move applicationId and version off ddtags onto a structured field at
debugger.snapshot.build so the web UI reads browser-build identity
from an unambiguous payload path instead of tags that can collide
with downstream enrichment. Drop the top-level application_id field
and the application_id/version ddtag entries that are now redundant.

Author: watson

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

@@ -321,9 +321,9 @@ describe('api', () => {
       expect(snapshot.duration).toBeGreaterThanOrEqual(10000000) // Should be in nanoseconds (>= 10ms)
     })
 
-    it('should include applicationId in snapshot payload and tags', () => {
+    it('should include build identity inside the snapshot payload', () => {
       initDebuggerTransport(
-        { service: 'test-service', env: 'test-env', applicationId: 'app-123' } as any,
+        { service: 'test-service', env: 'test-env', applicationId: 'app-123', version: '1.2.3' } as any,
         { add: mockBatchAdd } as any
       )
 
@@ -345,8 +345,10 @@ describe('api', () => {
       onReturn(probes, null, {}, {}, {})
 
       const payload = mockBatchAdd.calls.mostRecent().args[0]
-      expect(payload.application_id).toBe('app-123')
-      expect(payload.ddtags).toContain('application_id:app-123')
+      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', () => {

packages/debugger/src/domain/api.ts

@@ -276,6 +276,10 @@ function sendDebuggerSnapshot(probe: InitializedProbe, result: ActiveEntry): voi
             return: result.return,
           }
         : undefined,
+    build: {
+      applicationId: debuggerConfig.applicationId,
+      version: debuggerConfig.version,
+    },
   }
 
   const debuggerApi = globalObj.DD_DEBUGGER!
@@ -296,17 +300,14 @@ function sendDebuggerSnapshot(probe: InitializedProbe, result: ActiveEntry): voi
     buildTag('sdk_version', debuggerApi.version),
     buildTag('env', debuggerConfig.env),
     buildTag('service', debuggerConfig.service),
-    buildTag('version', debuggerConfig.version),
     buildTag('debugger_version', debuggerApi.version),
     buildTag('host_name', hostname),
-    buildTag('application_id', debuggerConfig.applicationId),
   ]
 
   const payload: Context = {
     message: result.message || '',
     hostname,
     service: debuggerConfig.service,
-    application_id: debuggerConfig.applicationId,
     ddtags: ddtags.join(','),
     logger,
     ...(dd ? { dd } : {}),