v0.15.0 — Full Audit Closure: 9 New Modules

What's New

9 New Core Modules

• ai_backend — Three-tier AI backend: OpenAI API → OSS Gradio model (rate-limited) → built-in rules. New humanize_ai() function.
• pos_tagger — Rule-based POS tagger for EN (500+ exceptions), RU/UK (200+), DE (300+). Universal tagset.
• cjk_segmenter — Chinese BiMM (2504 entries), Japanese character-type, Korean space+particle segmentation.
• syntax_rewriter — 8 sentence-level transforms (active↔passive, clause inversion, enumeration reorder, adverb migration). 150+ irregular verbs.
• statistical_detector — 35-feature ML classifier for AI text detection. Integrated into detect_ai() with 60/40 weighted merge.
• word_lm — Word-level unigram/bigram language model for 14 languages. Perplexity, burstiness, naturalness scoring.
• collocation_engine — PMI-based collocation scoring for context-aware synonym selection. EN ~130, RU ~30, DE ~20 collocations.
• fingerprint_randomizer — Anti-fingerprint diversification for output variety.
• benchmark_suite — 6-dimension automated quality benchmarking.

Pipeline & Detection

• Pipeline expanded to 17 stages (added syntax rewriting + anti-fingerprint diversification)
• detect_ai() now returns combined_score (statistical + heuristic)
• Fixed NO-OP _reduce_adjacent_repeats() — now actually removes repetitions

Tests

• 1,696 tests — 92 new, all passing (100% pass rate)