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* feat: add vendor text-watermark detection and SynthID image scorer sidecar Adds Layer B watermark detection as a first-class service capability: - text_detectors.py: a registry of text-watermark detectors behind one interface — Google's official SynthID-text detector via the Gemini API (taskType DETECT_TEXT_WATERMARK), a Claude placeholder ready for Anthropic's announced detection API, and the MarkLLM research harness (KGW / SynthID, same-config-only). Fail-soft: unconfigured or errored detectors never block cleaning. - server.py: new POST /detect endpoint, detect_before / detect_after options on /clean (before/after scoring for text and images), an opt-in /inspect "detect" flag, and /capabilities gains text_detectors and scorers.synthid_http. - synthid_score_server.py: a stdlib HTTP sidecar for the reverse-SynthID scorer, so the published core image never bundles the non-commercial upstream code; wired via WATERMARKS_SYNTHID_SCORER_URL. - score_synthid.py: extract score_file() so the CLI and the sidecar share one implementation. - compose.yaml / Dockerfile.synthid / .env.example: wr-synthid-score sidecar service and env wiring. - README + skill docs, plus tests for the detectors, the /detect endpoint, and the image sidecar. * feat: per-candidate watermark detection for Layer B rewrite candidates When --candidates N (N > 1) is combined with --markllm-scheme or WATERMARKS_GEMINI_API_KEY, run every configured text detector from the text_detectors.py registry on each candidate and report per-candidate measurements in --json-stats as candidate_scores entries carrying lexical_divergence, selection_score, selected, and per-detector reports (is_watermarked, score, threshold where the detector provides one). Candidate selection stays purely lexical; the detections are observability for correlating lexical divergence with watermark removal (issue #106). Converges rewrite_text.py onto the shared detector registry: - MarkLLMTextDetector gains constructor overrides (scheme, upstream_dir, model, timeout) plus the checkout-venv interpreter preference and the WATERMARKS_MARKLLM_RLIMIT_AS preexec guard ported from rewrite_text.py; the old _markllm_detect / _venv_python / _markllm_preexec helpers are gone. - run_all_text_detectors() accepts an injected MarkLLM instance and an include_markllm switch so CLI flag gating stays intact. - before/after/cleared semantics unchanged; detection remains fail-soft. * docs: pin Watermarks in the Sand reference to arXiv v5 * fix: mark only one rewrite candidate as selected (#110) --------- Co-authored-by: Zhenxin Ai <142008897+ai-kunkun@users.noreply.github.com>