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Native clients using Rust pairing can now receive the existing `desktop-code-v1` flow: accept its challenge, submit a user-entered six-digit code, handle correlated rejections, and require successful code submission before accepting the source proof. A failed durable import can explicitly acknowledge failure. Adds a public, live-session channel binding (session ID, ordered ephemeral peers and transcript commitment) so applications can authorize the exact exchange using each device's independently authenticated account session. The binding does not itself authorize secret export. Legacy APIs and the wire format remain compatible. Validation: 79 pairing unit tests and seven public API journeys pass, including wrong-code retries, five-attempt lockout, replay/peer rejection, failed import, and identical live bindings on both devices. Focused `cargo clippy -p buzz-core --all-targets -- -D warnings` and formatting pass. Repository formatting/mobile checks and desktop, web, and Flutter build/test lanes pass after installing the pinned Flutter dependencies. Three initial normal push-hook attempts stopped at different unrelated ACP deadlines. The final normal push passed all applicable hooks, including desktop Tauri Clippy/tests and the full Rust unit lane, with existing hook lanes serialized and four Rust test threads. No checks were disabled and no ACP source was changed. Independent review found no blocker in this API delta. App and human acceptance remain outstanding; this PR is a draft. --------- Signed-off-by: Matt Dickenson <mdickenson@squareup.com>