docs: state how language negotiation and consumer overrides interact, and pin it

[Decipher]

Summary

Documents the confirmed language behaviour and pins it with a kernel test: exposed values follow interface language negotiation, per-consumer overrides apply in every language, so a key can be translated or overridden but not both at once.

Changes

• README.md: a new FAQ entry stating the interaction plainly.
• CHANGELOG.md: the Known limitations bullet claimed language negotiation is not handled at all, which undersells it. It now states what actually happens.
• tests/src/Kernel/SettingsResolverLanguageTest.php: resolves under en and fr config override languages. Asserts the translated name comes back under fr with languages:language_interface in the cacheability, and that a consumer override returns the same value under both. This is the baseline per-language overrides (targeted at 1.1.0) start from.

Review notes

Stacked on the changelog branch (#8) because both edit the Known limitations block, so the diff shows its commit until #8 merges. Merge order 8 → 9 → 10 is conflict-free.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.12%. Comparing base (d793dcf) to head (889b66e).

Additional details and impacted files

@@                      Coverage Diff                       @@
##           feature/3-changelog-drupal-10       #9   +/-   ##
==============================================================
  Coverage                          86.12%   86.12%           
==============================================================
  Files                                  9        9           
  Lines                                490      490           
==============================================================
  Hits                                 422      422           
  Misses                                68       68           

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