--ffi manifest fails with SC5002 when the program does not use a binding

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typescript

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Read the check near line 330 in packages/compiler/src/frontend/lowering/native-ffi.ts and the "unused-missing" case in tests/harness/ffi.test.ts. Run that test to confirm the current behavior, then determine whether unused manifest bindings should be accepted or warned about. Done means the shared manifest case behaves as specified and the harness covers it, or a documentation note explains the intentional behavior.

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描述

scriptc 0.4.11, main at 918d80b26a, macOS arm64.

--ffi manifest with a binding the program never declares.

// unused.ts
console.log("unrelated");

ffi.json: {"ffi_format":1,"functions":[{"name":"nativeScale","symbol":"native_scale","params":["f64"],"returns":"f64"}],"libraries":[],"system_libraries":[]}

scriptc build unused.ts --ffi ffi.json fails with SC5002: FFI binding 'nativeScale' cannot be resolved: the program has no signature-only function declaration with this name.

Expected: a shared manifest listing bindings for several programs should not fail a program that does not use all of them (or the unused case should be a warning). Today one manifest per entry point is needed. The behavior is pinned by the "unused-missing" case in tests/harness/ffi.test.ts, so if it is intentional, a docs note would help. Check is in packages/compiler/src/frontend/lowering/native-ffi.ts (~line 330).

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