feat: add stream prefix options.proto

[yordis]

Summary

• Add trogon.stream.v1alpha1 options for stream identity prefixes (extension number 870011)
• Supports prefix and optional separator (defaults to ":") for aggregate stream naming
• Update field number registry and examples in extension naming docs

Test plan

• buf lint passes
• buf build passes

[cursor]

PR Summary

Low Risk
Adds a new protobuf options definition and documentation updates only; no runtime behavior changes unless downstream codegen/consumers start using the new extension.

Overview
Introduces proto/trogon/stream/v1alpha1/options.proto, adding an EnumValueOptions wrapper and a google.protobuf.EnumValueOptions extension (enum_value = 870011) to attach a required prefix and optional separator for stream identity naming.

Updates protobuf-extension-naming.md to reserve extension number 870011 for trogon.stream.v1alpha1, shift the available range to 870012–870999, and include the new module in the examples list.

^{Written by Cursor Bugbot for commit e85af42. This will update automatically on new commits. Configure here.}

[github-actions]

The latest Buf updates on your PR. Results from workflow Buf CI / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Feb 12, 2026, 10:05 PM

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch stream-prefix

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