Two campaigns sharing a credential wordlist; everything else (ASN, IPs,
JA3, HASSH, active hours) divergent. Pass condition: clusterer must NOT
merge. Protects against the "credential overlap is identity" failure
mode that commodity wordlists invite.
* tests/clustering/fixture_harness.py — shared assert_fixture_bounds
helper + identity_clusterer (placeholder, trivially correct on
all-singleton fixtures) + credential_jaccard_clusterer (deliberately-
bad reference used to PROVE the fixture catches what it should).
* tests/clustering/test_shared_wordlist_fixture.py — bounds pass with
identity, bounds FAIL (homogeneity → 0) with the bad credential
clusterer. The latter is the proof the fixture earns its keep.
* tests/fixtures/campaigns/shared_wordlist.{yaml,expected.yaml}.
* tests/clustering/test_lone_wolf_fixture.py — refactored onto the
shared harness. No behavior change.
anti
e80f3eec54