Ban Type Assertions

Enable typescript/consistent-type-assertions with assertionStyle: 'never' (native oxlint, v1.44.0+) and replace all as X / <T>x casts with patterns the compiler can verify. as const is preserved — the ban is surgical: it targets real casts, not literal narrowing.

Core Philosophy

Pick the strictly correct path, not the simpler one.

Every as assertion is a spot where the developer told the compiler "trust me." The goal is to make the compiler verify instead. If you replace as Foo with a type guard that is equally unverified, you have not improved anything — you have just moved the assertion.

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