🔊 Send source-code-context telemetry usage

[amortemousque]

Motivation

Measure customer adoption of the microfrontend source code attribution feature (DD_SOURCE_CODE_CONTEXT global).

Changes

• packages/rum-core/src/domain/contexts/sourceCodeContext.ts: call addTelemetryUsage({ feature: 'source-code-context' }) when window.DD_SOURCE_CODE_CONTEXT is set
• Regenerated telemetryEvent.types.ts and rumEvent.types.ts from the updated rum-events-format schema (adds SourceCodeContext to TelemetryBrowserFeaturesUsage)

Test instructions

1. yarn dev
2. Open http://localhost:8080/test.html (sets window.DD_SOURCE_CODE_CONTEXT before RUM init and configures telemetry sample rates to 100)
3. Look at Browser SDK extension event

Checklist

• Tested locally
• Tested on staging
• Added unit tests for this change.
• Added e2e/integration tests for this change.
• Updated documentation and/or relevant AGENTS.md file

[cit-pr-commenter-54b7da]

Bundles Sizes Evolution

📦 Bundle Name	Base Size	Local Size	𝚫	𝚫%	Status
Rum	173.72 KiB	173.76 KiB	+42 B	+0.02%	✅
Rum Profiler	8.07 KiB	8.07 KiB	0 B	0.00%	✅
Rum Recorder	21.23 KiB	21.23 KiB	0 B	0.00%	✅
Logs	57.05 KiB	57.05 KiB	0 B	0.00%	✅
Rum Slim	131.41 KiB	131.44 KiB	+36 B	+0.03%	✅
Worker	22.99 KiB	22.99 KiB	0 B	0.00%	✅

🔗 RealWorld

[datadog-prod-us1-3]

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 76.83% (+0.00%)

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: d84a9f4 | Docs | Datadog PR Page | Give us feedback!}