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visual-search/__pycache__/pattern_siblings.cpython-312.pyc

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When a photo matches one COLORWAY, also return the other colorways of the same PATTERN.
Ported (not forked) from ~/Projects/dw-pairs-well/tools:
  * signature  = ci-hash-build.py        dHash(8) of grayscale + dHash of the tonal inverse
  * distance   = pattern-id-titlefirst-final.py ci_dist: min of the 4 cross Hamming distances,
                 so light-on-dark and dark-on-light colorways of one motif still match
  * threshold  = HAM_THRESH default 30 (WS-1 value chosen 2026-06-26 in that script)
  * grouping   = the WS-1 title-first + CI-confirmed map pattern-id-titlefirst-by-dwsku.json

Candidate siblings come from (1) the WS-1 pattern_id group, else (2) same vendor + same normalized
pattern_name in the search index. Each candidate is then CONFIRMED by the colour-invariant distance
when both hashes are known; unhashed candidates are returned as confirmed=None (never guessed).

Env: PAIRS_WELL_TOOLS (default ~/Projects/dw-pairs-well/tools), HAM_THRESH (30),
     PATTERN_SIBLINGS_FETCH=1 to hash missing images on the fly (bounded, disk-cached, $0).
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