anti d743d38cac feat(ttp): load MITRE ATT&CK from official STIX 2.1 bundle ...

Replace the hand-maintained TECHNIQUE_NAMES dict (pinned to v15.1) with
a runtime loader that reads the official enterprise-attack-N.json STIX
bundle. Version bumps now require only updating attack_version.py;
sub-technique parents, tactic IDs, and kill-chain phases all come from
MITRE's published data.

- decnet/ttp/attack_version.py pins version 19.0 + sha256 + URL
- decnet/ttp/attack_stix.py is the lazy STIX loader. Resolution order:
  DECNET_ATTACK_BUNDLE env -> ~/.cache/decnet/attack/ -> fetch from
  the pinned MITRE GitHub URL. SHA-256 verified before parse;
  mismatch fails closed.
- decnet/ttp/attack_catalog.py collapses to a shim re-exporting
  technique_name() so the ~9 router/repo call sites don't churn.
- python -m decnet.ttp.attack_stix fetch warms the cache and can
  print sha256 for version-bump workflows.
- test_attack_catalog.py now asserts every rule-emitted ID resolves
  in the loaded bundle (same contract, real source) and exercises
  the SHA-256-mismatch fail-closed path.

2026-05-09 05:54:36 -04:00

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