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* Fix betterproto2 migration: update generated proto code and callers The dependency switch from betterproto to betterproto2 was incomplete. This updates all affected files to use the betterproto2 API: - tombstone.py: rewrite generated code to use betterproto2.field() with explicit TYPE_* constants, repeated/optional/group flags, and map_meta() for map fields - tombstone_crashes.py: update import and fix to_dict() call to use keyword-only casing= argument required by betterproto2 - pyproject.toml: replace betterproto[compiler] dev dep with betterproto2-compiler - Makefile: update protoc plugin flag to --python_betterproto2_out * Fix STIX2 hash key parsing to accept spec-compliant algorithm names The STIX2 specification requires single quotes around hash algorithm names that contain hyphens (e.g. file:hashes.'SHA-256'). MVT only accepted a non-standard lowercase form (file:hashes.sha256), silently dropping any indicators using the spec-correct spelling. Normalize hash algorithm keys in _process_indicator by stripping quotes and hyphens from the algorithm portion before matching, so all of the following are accepted for SHA-256, SHA-1 and MD5: file:hashes.'SHA-256' (STIX2 spec) file:hashes.SHA-256 file:hashes.SHA256 file:hashes.sha256 (previously the only accepted form) The same normalization is applied to app:cert.* keys. Update generate_stix.py to use the spec-compliant quoted forms, and add test_parse_stix2_hash_key_variants to cover all spelling variants.