[risu729]

This replaces #1570. It keeps Codex's commits unchanged and adds one fix commit and a merge of main.

The fix commit:

• Direct imports. The case modules now import it, expect, vi, syncedSettings, mergeSyncedSettings and the MAX_SETTINGS_* constants directly. They no longer arrive through the fixture object, which now carries only fixtures, the same as the other registrars under test/. The entry drops the two constants it only passed along.
• Import order. The registrar imports in the entry now come after the local imports.
• Docs. The paragraph moves into its own section after the other test organization sections and now describes the layout rather than the change. It no longer calls settings-sync.test.ts the sole settings sync entry, because settings-sync.lost-base.test.ts and settings-sync.property.test.ts are entries too.

The merge of main resolves two conflicts:

• .oxlintrc.json: test: organize recipe sync cases without changing discovery #1577 had removed the adjacent recipes.test.ts exemption, so both lines are dropped.
• The docs sections: both sections are kept.

Verification

• Test discovery. The collected test IDs on main and on this branch are identical, including their order: 95 tests, all passing.
• Independent review. A reviewer pasted each registrar's body back in place of its call. Apart from the exported fixture type, the result is identical to origin/main. There are no hooks or mocks, and every describe-local fixture is a const.
• Checks. oxlint, oxfmt, rumdl and the extension type check all pass.

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