lyrics: add --no-keep-synced CLI option

[snejus]

• This change adds a small CLI override to beetsplug/lyrics.py: --no-keep-synced. It is the inverse of --keep-synced, and lets one manual lyrics run ignore the configured keep_synced: yes.

[Copilot]

Pull request overview

grug see PR add new CLI flag for lyrics plugin. goal: one manual beet lyrics run can ignore config keep_synced: yes and not skip synced-lyrics items.

Changes:

• add --no-keep-synced option to lyrics command, mapping to keep_synced=False
• add pytest for config-vs-CLI precedence for keep_synced
• update lyrics plugin docs + changelog entry

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
beetsplug/lyrics.py	add --no-keep-synced CLI option (inverse of --keep-synced)
test/plugins/test_lyrics.py	add test for CLI overriding keep_synced config
docs/plugins/lyrics.rst	document new --no-keep-synced usage
docs/changelog.rst	add unreleased changelog note for new option

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.03%. Comparing base (37e2a8b) to head (eeb1960).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6769      +/-   ##
==========================================
+ Coverage   74.85%   75.03%   +0.18%     
==========================================
  Files         163      163              
  Lines       20947    20948       +1     
  Branches     3299     3299              
==========================================
+ Hits        15680    15719      +39     
+ Misses       4510     4469      -41     
- Partials      757      760       +3     

Files with missing lines	Coverage Δ
beetsplug/lyrics.py	90.00% <100.00%> (+7.72%)	⬆️

... and 1 file with indirect coverage changes

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