Move Public API baselines

[martincostello]

• Move public API baselines into a .PublicAPI folder.
• Add support for possible future target-specific public API baselines.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.15%. Comparing base (c4b9091) to head (5df5f06).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3016   +/-   ##
=======================================
  Coverage   96.15%   96.15%           
=======================================
  Files         310      310           
  Lines        7135     7135           
  Branches     1005     1005           
=======================================
  Hits         6861     6861           
  Misses        221      221           
  Partials       53       53           

Flag	Coverage Δ
linux	96.15% <ø> (ø)
macos	96.15% <ø> (ø)
windows	96.15% <ø> (ø)

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[Copilot]

Pull request overview

Moves PublicApiAnalyzers baseline files into per-project .PublicAPI/ folders and updates the shared MSBuild targets to pick up these baselines (including a path for future target-specific baselines).

Changes:

• Add .PublicAPI/PublicAPI.Shipped.txt and .PublicAPI/PublicAPI.Unshipped.txt to multiple projects.
• Update eng/Library.targets to include .PublicAPI baseline files as AdditionalFiles.
• Add conditional inclusion hooks for potential future target-/TFM-specific baseline folders.

Reviewed changes

Copilot reviewed 1 out of 11 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/Polly/.PublicAPI/PublicAPI.Unshipped.txt	Adds Polly’s unshipped public API baseline file in .PublicAPI/.
src/Polly/.PublicAPI/PublicAPI.Shipped.txt	Adds Polly’s shipped public API baseline file in .PublicAPI/.
src/Polly.Testing/.PublicAPI/PublicAPI.Unshipped.txt	Adds Polly.Testing’s unshipped public API baseline file in .PublicAPI/ (nullable enabled).
src/Polly.Testing/.PublicAPI/PublicAPI.Shipped.txt	Adds Polly.Testing’s shipped public API baseline file in .PublicAPI/ (nullable enabled).
src/Polly.RateLimiting/.PublicAPI/PublicAPI.Unshipped.txt	Adds Polly.RateLimiting’s unshipped public API baseline file in .PublicAPI/ (nullable enabled).
src/Polly.RateLimiting/.PublicAPI/PublicAPI.Shipped.txt	Adds Polly.RateLimiting’s shipped public API baseline file in .PublicAPI/ (nullable enabled).
src/Polly.Extensions/.PublicAPI/PublicAPI.Unshipped.txt	Adds Polly.Extensions’ unshipped public API baseline file in .PublicAPI/ (nullable enabled).
src/Polly.Extensions/.PublicAPI/PublicAPI.Shipped.txt	Adds Polly.Extensions’ shipped public API baseline file in .PublicAPI/ (nullable enabled).
src/Polly.Core/.PublicAPI/PublicAPI.Unshipped.txt	Adds Polly.Core’s unshipped public API baseline file in .PublicAPI/ (nullable enabled).
src/Polly.Core/.PublicAPI/PublicAPI.Shipped.txt	Adds Polly.Core’s shipped public API baseline file in .PublicAPI/ (nullable enabled).
eng/Library.targets	Wires .PublicAPI baselines into AdditionalFiles, with conditional hooks for future target-specific baselines.

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