Rename IAuthorizationHeaderBoundProvider to IAuthorizationHeaderProvider2

[Copilot]

The interface IAuthorizationHeaderBoundProvider was originally named for bound token scenarios but has expanded beyond that scope. Renaming to IAuthorizationHeaderProvider2 better reflects its generalized purpose.

Description

• Interface renamed: IAuthorizationHeaderBoundProvider → IAuthorizationHeaderProvider2

  • File: src/Microsoft.Identity.Abstractions/DownstreamApi/IAuthorizationHeaderBoundProvider.cs → IAuthorizationHeaderProvider2.cs
  • Interface definition updated in source

• Public API surface updated across all target frameworks:

  • PublicAPI.Unshipped.txt files for net462, net8.0, net9.0, net10.0, netstandard2.0, netstandard2.1

• Documentation updated:

  • README.md: Class diagrams and interface references
  • agents.md: Interface description
  • Structure.txt: Interface listing

Breaking Change

This is an API-breaking change for version 9.6. Safe to apply as the feature was never released.

// Before
public interface IAuthorizationHeaderBoundProvider : IAuthorizationHeaderProvider<OperationResult<...>>

// After  
public interface IAuthorizationHeaderProvider2 : IAuthorizationHeaderProvider<OperationResult<...>>

Fixes #227

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Rename IAuthorizationHeaderBoundProvider to IAuthorizationHeaderProvider1 (API change for 9.6)</issue_title>
<issue_description>Is your feature request related to a problem? Please describe.
The interface currently named IAuthorizationHeaderBoundProvider is now recognized as being more generic than just bound tokens. The naming doesn't accurately reflect its expanded scope.

Describe the solution you'd like
Rename IAuthorizationHeaderBoundProvider to IAuthorizationHeaderProvider1 throughout the repository. This change aligns the interface name with its actual usage and increases clarity for future maintenance and contributions.

• Update all usages, references, and documentation to the new interface name.
• Version update: Targeting version 9.6

Describe alternatives you've considered
Keeping the original name, but this would lead to confusion as the interface responsibilities have expanded.

Additional context
This is a breaking change in API surface but is safe to apply since the impacted feature was never released.

---

Labels: api-change
Milestone: 9.6
</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Rename IAuthorizationHeaderBoundProvider to IAuthorizationHeaderProvider2 (API change for 9.6) #227

---

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.

[jmprieur]

This is great @copilot
but we've decided to name the interface IAuthorizationHeaderProvider2 (and not IAuthorizationHeaderProvider1)

Can you please make this change?
I've updated the issue, btw: #227

[Copilot]

This is great @copilot
but we've decided to name the interface IAuthorizationHeaderProvider2 (and not IAuthorizationHeaderProvider1)

...

Done! Updated the interface name to IAuthorizationHeaderProvider2 throughout the repository. All references have been updated including the interface file, PublicAPI files, README.md, agents.md, and Structure.txt. (commit b72dce9)

[jmprieur]

LGTM
Thanks copilot