Move ConsensusExtensionsTick.h from xrpld/app/consensus/ to
xrpld/consensus/ — it's a pure template with no app-layer deps.
Extract Peer::Extensions::onTick() definition into test/csf/PeerTick.h
so Peer.h no longer includes from xrpld/app/.
Eliminates the test.csf > xrpld.app levelization edge.
Add --explain flag to levelization.py for tracing dependency edges.
Add Builds/levelization/levelization.py for fast local iteration and semantic comparison against canonical shell output via --compare-to.
Keep Builds/levelization/levelization.sh as canonical path, and update levelization workflow to fail if python output diverges from shell-generated results.
Also harden interactive-shell detection in levelization.sh for portability and document local usage in README.
