Make the catalog hash honest, share the text helpers, drop the duplicate labels

`catalog_hash` hashed the CSV and the view *names*, so replacing
`sku_l09.jpg` with a different product's packshot left the hash unchanged and
a report could claim the same catalog while every l09 decision in it had
moved. It hashes each view's bytes now.

`identity_lanes` carried its own `normalize_text` and `bigrams`, near-copies
of the ones in `rebuild_catalog` that had already drifted (the lane's table
folded ユ to itself, the catalog's did not). The lane imports the catalog's
now, so one read scores the same either way.

`evidence/image6_v2.json` was byte-identical to `eval/labels/image6.json`; the
evidence scripts and the decision document point at the canonical file and the
copy is gone. `score_crop`'s docstring now states the contract its callers
already depend on: the dict's insertion order is the lane's ranking, and
re-sorting by value names a different SKU than the lane chose.

Tests: the lane is shared by the classify pool, so a concurrent-ranking test
pins that one BFMatcher does not cross crops under eight threads.

recognization/docs/research/2026-09-28-recognition-architecture/evidence/lfo_setup.py

@@ -4,7 +4,7 @@ image6_v2_lfo.json with those reference facings excluded from scoring.
 Same-photo references make this an optimistic proxy, not a held-out result."""
 import json, cv2, os, shutil, collections
 E = os.path.dirname(os.path.abspath(__file__))
-L = json.load(open(f'{E}/image6_v2.json')); im = cv2.imread('add/image6.jpg')
+L = json.load(open(f'{E}/../../../../eval/labels/image6.json')); im = cv2.imread('add/image6.jpg')
 by = collections.defaultdict(list)
 for f in L['facings']:
     if f['label'] not in ('unknown', 'exclude'): by[f['label']].append(f)