chore: catch up tidy and tests

[tisonkun]

No description provided.

[Copilot]

Pull request overview

This PR performs cleanup work to improve documentation accuracy and test coverage for the OnceMap and singleflight::Group types. The changes include grammar corrections, test additions, and trait assertion tests.

Changes:

• Fixed grammar error in OnceMap::discard documentation ("remove" → "removed")
• Corrected CHANGELOG method name reference (Group::remove → Group::forget)
• Added comprehensive test coverage for OnceMap and singleflight::Group including constructors, concurrent operations, and edge cases
• Added trait assertions for Send, Sync, and Unpin for OnceMap and singleflight::Group

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
mea/src/once/once_map/mod.rs	Fixed grammar in documentation comment (spelling correction)
CHANGELOG.md	Corrected method name from remove to forget in API change description
mea/src/lib.rs	Added trait assertions for OnceMap and singleflight::Group to verify they are Send, Sync, and Unpin
mea/src/once/once_map/tests.rs	Added comprehensive tests for constructor methods, concurrent failure handling, removal during computation, and complex key types
mea/src/singleflight/tests.rs	Added comprehensive tests for try_work method including simple cases, coalescing, failure handling, and concurrent retry scenarios

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