[OskarEichler]

Problem

Fuse stores configured key IDs in ordinary objects. A key named __proto__ therefore invokes the inherited prototype setter instead of recording its numeric index. Text searches can mask this because they scan every indexed field, but an object query for that configured key reads the wrong field and returns no match.

Fix

• Use null-prototype objects for KeyStore and both FuseIndex key-map initializations.
• Add a public object-query regression for an own __proto__ data field.
• Rebuild the committed distributions.

No behavior changes for ordinary key names.

Verification

• Full suite: 22 files and 450 tests passed.
• ESLint and TypeScript checks passed.
• All package distributions rebuilt successfully.
• Changed files pass Prettier and git diff --check.
• The repository-wide format command still encounters its existing parser failure on import-assertion syntax in three untouched tests; no affected file has a formatting error.