Promote ScriptableRenderer renderer-recording context methods to the primary Universal execution seam and route the renderer-driven pipeline through that seam.
Update managed probes and scripting expectations to cover the new non-public renderer recording contract, and archive the completed phase plan.
Introduce renderer-driven and renderer-backed managed pipeline base types in the Universal package.
Move shared renderer-data/default-renderer ownership out of UniversalRenderPipelineAsset, migrate probe assets onto the generic seam, and expose renderer recording/request context types for future SRP expansion.
Update scripting API-surface expectations and validate with build, unit tests, scripting tests, and old editor smoke.
