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Follow-up to #8654, from [Kalvin's review note](https://github.com/block/buzz/pull/8654#discussion_r4407146414). `native_toolchain_c`'s `CBuilder` registers only the listed C sources (and files under `includes`) as build-hook dependencies. The `buzz_secp256k1` hook lists four sources and no headers, so after an initial build a header-only vendor update (for example `src/modules/schnorrsig/main_impl.h`) could reuse the old library in incremental app and test builds. The hook now also registers every `.h` file under the vendored tree. It does not add include paths, so compilation is unchanged. ### Validation - With the change, editing the content of `third_party/secp256k1/src/modules/schnorrsig/main_impl.h` makes the next `dart test` rebuild `libbuzz_secp256k1.dylib`. Without it, the library is reused unchanged. - The hook output now lists all 62 vendored headers as dependencies. - Package tests pass (27). buzz-review-completed (Codex and security review clean; agent verification above; build-only change, no app behavior to test) 🤖 Generated with [Claude Code](https://claude.com/claude-code) Signed-off-by: Tom Brow <tomb@block.xyz> Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>