Summary

Bumps the Synonym Fork to v0.7.0-rc.33 and adds a connection_timeout_secs field to ElectrumSyncConfig (default: 10 s). This bounds Electrum socket operations for both the BDK on-chain and LDK tx-sync clients, preventing Tokio's blocking thread pool from being exhausted by threads stuck on dead sockets under total packet loss (e.g. a captive portal on iOS).

Changes

• Added connection_timeout_secs: u64 field to ElectrumSyncConfig (default: 10 s). Set to 0 to disable; values above 255 are capped to 255 with a warning logged.

Breaking change: existing struct-literal construction of ElectrumSyncConfig must add the new connection_timeout_secs field or switch to ElectrumSyncConfig { .., ..Default::default() }.

Testing

• Verify Electrum sync succeeds under normal network conditions.
• Verify that connecting to a dead/unreachable Electrum server times out within ~10 seconds rather than hanging indefinitely.
• Verify that setting connection_timeout_secs = 0 disables the timeout.
• Verify that values above 255 are capped and a warning is logged.
• Run existing CI test suite across Rust, Kotlin, Swift, and Python bindings.