replayEventsFromFile
Replays events from a file in a single pass.
The file contains concatenated tagged-SCALE hex events (same format as replayEvents hex parameter). Rust reads the file in native memory, avoiding JVM heap pressure for large event sets (PREPROD: 250k+ events).
Single-pass replay ensures generation collapses and Merkle tree rehash happen exactly once, producing roots that match the node's root history.
Return
New DustLocalState, or null on error
Parameters
seed
32-byte dust seed
filePath
Absolute path to the hex events file