[Sild]

Summary

• Pin upstream TON to v2026.10 (verified tag commit 857b8a57a178e6ae0fe7fa86e7d81c5233de8560).
• Bump tonlib-sys from 2026.8.0 to 2026.10.0.

ABI comparison

• tonlib_client_json.h and emulator-extern.h are byte-for-byte unchanged from v2026.08 (7 and 33 C exports respectively). No Rust FFI signature or ownership changes are needed.
• The new native macOS build passed all three runtime export tests.

Validation

• cargo test (3 tests passed)
• cargo +nightly fmt -- --check
• cargo clippy --all-targets -- -D warnings
• cargo clippy --all-targets --all-features -- -D warnings
• RUSTDOCFLAGS="-D warnings" cargo doc --no-deps --all-features
• cargo package --list
• cargo publish --dry-run --allow-dirty (dry run only; no upload)
• git diff --check and Rust pre-push checks

Linux linkage remains for CI to verify. A pre-existing build.rs full-clone fallback does not explicitly select the tag; the normal tag clone succeeded here and its HEAD was verified.