[snejus]

Depends on: #7093

Summary

Clears out the warnings the test suite emits under Python 3.14, so the output is readable again and real warnings stand out.

• codecs.open removed (beetsplug/edit.py:429, beetsplug/export.py:210) - deprecated since 3.11, plain open() with encoding= is the drop-in replacement. Same in test/plugins/test_edit.py.
• Class-scoped fixtures declared as @classmethod across 8 test modules - pytest warns when a scope="class" fixture is defined as an instance method, since there is no per-test instance to bind to. self.X references become cls.X.
• test_bpd.py fork handling - 3.14 defaults to forkserver on Linux, but the BPD server subprocess needs to inherit the parent's patched gstplayer and mock state, so the start method is now forced to fork unconditionally. Under pytest-xdist the parent is multi-threaded, which 3.14 warns about; ignored at module level with a comment explaining why it's safe here.
• Warnings we can't fix are ignored narrowly - asyncio policy deprecations pinned in setup.cfg, pathlib.PurePath.as_uri() on the one test_thumbnails.py test that exercises it, and legacy string-field deprecations in test/autotag/test_hooks.py where the deprecated fields are the thing under test.

[github-actions]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.69%. Comparing base (b7ebf6d) to head (3f619e0).
⚠️ Report is 3 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7099      +/-   ##
==========================================
+ Coverage   80.49%   80.69%   +0.20%     
==========================================
  Files         149      149              
  Lines       21243    21241       -2     
  Branches     3281     3281              
==========================================
+ Hits        17099    17140      +41     
+ Misses       3315     3274      -41     
+ Partials      829      827       -2     

Files with missing lines	Coverage Δ
beetsplug/edit.py	78.26% <100.00%> (-0.08%)	⬇️
beetsplug/export.py	88.59% <ø> (-0.10%)	⬇️

... and 4 files with indirect coverage changes

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