fix: lucene_sanitize corrupts all words containing O/R/N/T/A/D

[totto]

What

lucene_sanitize() added individual uppercase letters O, R, N, T, A, D to the character escape map in an attempt to neutralise Lucene's boolean operators (AND, OR, NOT). This corrupted every word containing those letters:

lucene_sanitize("Robot")    # "\R\ob\ot"
lucene_sanitize("Toronto")  # "\T\or\on\t\o"
lucene_sanitize("ORANGE")   # "\O\R\A\N\GE"
lucene_sanitize("NOT")      # "\N\O\T"  (this part worked, sort of)

Why it matters

Any full-text search query containing common English words with capital letters returns corrupted Lucene syntax, producing no results or query parse errors.

Fix

Remove the letter entries from the escape map. Add a word-boundary regex substitution that lowercases only the standalone boolean keywords AND, OR, NOT. Lowercase and/or/not are not Lucene operators and are indexed as literal words:

sanitized = re.sub(r'\b(AND|OR|NOT)\b', lambda m: m.group(0).lower(), sanitized)

lucene_sanitize("Robot")          # "Robot"    ✓
lucene_sanitize("Toronto")        # "Toronto"  ✓
lucene_sanitize("status OR error") # "status or error"  ✓ (OR neutralised)
lucene_sanitize("foo AND bar")    # "foo and bar"  ✓

re is already imported in helpers.py.

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