v2.0.0-rc.3

Features:

• The big change is feature extraction. litmus now computes the full set of fields the latest azoth model wants
• The ML JSON output is now unambiguous. Schema v=5 replaces the old oclass/oprob and threshold pair with a single self-consistent

Fixes:

• Repaired the json→model plumbing: reading the ff/m/ms fields out of filefacts had broken.
• scan.rs lost ~350 lines in the process; same behavior, less machinery.

Operational:

• The WORKERS knob is honored across all worker scripts (alpine, bastille, debian, macos, omnios, openbsd), with better update logging.
• scan-no-deadlock now emits logs so a hang is diagnosable.