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Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Adds `webhook_secret: Option<String>` to `WebhookEndpoint`. When set, every incoming request must carry an `X-Barqflow-Signature-256: sha256=<hex>` header whose value is `HMAC-SHA256(secret, raw_body)`. Verification uses constant-time comparison via the `hmac` crate to prevent timing attacks. Requests without or with an invalid signature are rejected with 403. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Five unit tests covering: valid signature passes, wrong secret rejected, missing header rejected, secret-less endpoint bypasses check, and tampered body rejected. All test the pure `verify_hmac_signature` function without requiring a database. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Update transitive deps to patched releases: quinn-proto 0.11.14 (RUSTSEC-2026-0037), rustls-webpki 0.103.13 (RUSTSEC-2026-0049/0098/0099/0104), thin-vec 0.2.18 (RUSTSEC-2026-0103), rand 0.8.6/0.9.4/0.10.1 (RUSTSEC-2026-0097), and the wasm-bindgen/js-sys/web-sys family off yanked versions. Add .cargo/audit.toml ignoring RUSTSEC-2023-0071 (rsa Marvin Attack): no upstream fix exists, it is unavoidable via sqlx-mysql, and our only direct use is public-key signature verification, which is not exposed to the timing sidechannel on private-key operations.
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