The Bitcoin Core node is the authority on descriptor validity.
Reimplementing descriptor shape/prefix/checksum checks here creates
a divergence risk with the node's own validator and adds maintenance
surface for no real safety gain. Invalid descriptors now fail at the
node, surfaced through AnalysisError.
- delete api/src/preflight.rs and its module declaration
- drop ValidationError from ApiError (no remaining producers)
- remove the validate() call from the scan handler
- drop the two tests that asserted preflight-specific rejection codes
Replace the inline cookie split with stealth_bitcoincore::read_cookie_file,
which already implements the same parsing with proper error handling.
Removes duplication and keeps the cookie format in one place.
LORDBABUINO