feat: multilingual crisis detection (#706)

Add crisis detection for 6 languages:
Spanish, French, German, Portuguese, Chinese, Japanese.

Same categories as English: direct_suicidal, method_seeking, despair.
Crisis threshold: 0.05 (extremely sensitive).

Closes #706

shield/multilingual_crisis.py

@@ -0,0 +1,276 @@
+#!/usr/bin/env python3
+"""Multilingual Crisis Detection Patterns.
+
+Extends the English crisis detector with patterns for:
+  Spanish, French, German, Portuguese, Chinese, Japanese
+
+Usage:
+  from multilingual_crisis import detect_multilingual, MULTILINGUAL_CRISIS_PATTERNS
+  result = detect_multilingual(user_message)
+  if result["crisis_detected"]:
+      # Route to crisis protocol
+      pass
+"""
+
+import re
+from typing import Optional
+
+MULTILINGUAL_CRISIS_PATTERNS = {
+
+    # Spanish (es)
+    "direct_suicidal_es": {
+        "patterns": [
+            r"(?:quiero|necesito|voy a|pensando en|planeando)\s+(?:morir|suicidarme|matarme|acabar con todo|quitarme la vida)",
+            r"suicid(?:io|arme|arse|al)",
+            r"(?:quiero|necesito|ojal[aá])\s+(?:estar|ser|quedarme)\s+muerto",
+            r"(?:no|ya no)\s+(?:quiero|puedo|soporto)\s+(?:vivir|seguir|estar aqu[ií]|existir)",
+            r"(?:acabar|terminar)\s+(?:con\s+)?(?:todo|mi\s+vida|conmigo)",
+            r"(?:nadie)\s+(?:echar[ií]a|extra[nñ]ar[ií]a|notar[ií]a|importar[ií]a)\s+(?:de\s+)?(?:menos|mi\s+falta)",
+            r"(?:mi|la)\s+vida\s+(?:no\s+)?(?:vale|sirve|tiene\s+sentido)",
+            r"(?:ser[ií]a|estar[ií]a)\s+(?:mejor|todos\s+estar[ií]an\s+mejor)\s+(?:si\s+)?(?:no\s+estuviera|sin\s+mi|muerto)",
+        ],
+        "weight": 1.0, "lang": "es", "description": "Spanish: direct suicidal ideation"
+    },
+    "method_seeking_es": {
+        "patterns": [
+            r"(?:c[oó]mo|qu[eé]\s+(?:forma|manera)|mejor\s+forma)\s+(?:de\s+)?(?:morir|suicidarme|matarme|acabar)",
+            r"(?:dosis|cantidad)\s+(?:letal|fatal|mortal|letales)",
+            r"(?:pastillas|medicamentos?|f[aá]rmacos?)\s+(?:para\s+)?(?:morir|suicidarme|matarme)",
+            r"cort(?:arme|ar)\s+(?:las\s+)?(?:venas|muñecas|garganta)",
+            r"(?:ahorcarme|colgarme|saltar|tirarme)\s+(?:de|del|desde)?",
+            r"(?:forma|manera|m[eé]todo)\s+(?:indolora|r[aá]pida|sin\s+dolor)\s+(?:de\s+)?(?:morir|acabar)",
+        ],
+        "weight": 1.0, "lang": "es", "description": "Spanish: method seeking"
+    },
+    "despair_es": {
+        "patterns": [
+            r"(?:no|ya\s+no)\s+(?:puedo|soporto|aguanto|resisto)\s+m[aá]s",
+            r"(?:estoy|me\s+siento)\s+(?:perdido|solo|vac[ií]o|sin\s+esperanza|agotado)",
+            r"(?:no\s+tiene|no\s+hay)\s+(?:sentido|soluci[oó]n|salida|esperanza)",
+            r"para\s+(?:qu[eé]|qu[iíén])\s+(?:si|vivo|me\s+esfuerzo)",
+            r"(?:soy|me\s+siento\s+como)\s+(?:una\s+)?(?:carga|peso|estorbo|in[uú]til)",
+        ],
+        "weight": 0.5, "lang": "es", "description": "Spanish: despair indicators"
+    },
+
+    # French (fr)
+    "direct_suicidal_fr": {
+        "patterns": [
+            r"(?:je\s+(?:veux|vais|pense\s+[àa]|planifie)|j'ai\s+envie\s+de)\s+(?:mourir|me\s+suicider|me\s+tuer|en\s+finir)",
+            r"suicid(?:e|er|aire)",
+            r"(?:je\s+ne\s+)?(?:veux|peux|supporte)\s+(?:plus\s+)?(?:vivre|exister|continuer)",
+            r"(?:en|j'en)\s+finir\s+(?:avec\s+)?(?:tout|la\s+vie|moi|m[eê]me|[çc]a)",
+            r"(?:personne|nul\s+ne|aucun)\s+(?:ne\s+)?(?:me\s+)?(?:manquera|regretterait|remarquerait)",
+            r"(?:ma|cette)\s+vie\s+(?:ne\s+vaut|n'a\s+(?:pas\s+)?de\s+sens|est\s+(?:finie|inutile))",
+            r"(?:tout\s+le\s+monde|on)\s+(?:serait|irait)\s+(?:mieux|bien)\s+(?:sans\s+moi)",
+        ],
+        "weight": 1.0, "lang": "fr", "description": "French: direct suicidal ideation"
+    },
+    "method_seeking_fr": {
+        "patterns": [
+            r"(?:comment|quel(le)?\s+(?:est\s+le\s+)?(?:meilleur|moyen))\s+(?:de\s+)?(?:mourir|se\s+suicider|se\s+tuer|en\s+finir)",
+            r"(?:dose|quantit[eé])\s+(?:l[eé]tale?|fatale?|mortelle?)",
+            r"(?:comprim[eé]s?|pilules?|m[eé]dicaments?)\s+(?:pour\s+)?(?:mourir|se\s+tuer|overdose)",
+            r"(?:se\s+)?couper\s+(?:les\s+)?(?:veines|poignets|gorge)",
+            r"(?:se\s+)?pendre|se\s+(?:jeter|lancer)\s+(?:du|de\s+la|dans)",
+            r"(?:moyen|fa[cç]on|mani[eè]re)\s+(?:indolore|rapide|sans\s+douleur)\s+(?:de\s+)?(?:mourir|en\s+finir)",
+        ],
+        "weight": 1.0, "lang": "fr", "description": "French: method seeking"
+    },
+    "despair_fr": {
+        "patterns": [
+            r"(?:je\s+ne\s+)?(?:peux|supporte|arrive\s+[àa])\s+(?:plus\s+)?(?:continuer|tenir|durer|avancer)",
+            r"(?:je\s+suis|je\s+me\s+sens)\s+(?:perdu|seul|vide|sans\s+espoir|au\s+bout)",
+            r"(?:il\s+n'y\s+a|y\s+a\s+(?:pas\s+)?(?:de\s+)?)?(?:plus\s+)?(?:d'?espoir|de\s+solution|d'issue|de\s+sens)",
+            r"(?:je\s+suis|c'est)\s+(?:un\s+)?(?:fardeau|poids|inutile|nul)",
+            r"(?:pourquoi|[àa]\s+quoi\s+bon|pour\s+qui)\s+(?:je\s+)?(?:vis|m'efforce|continue)",
+        ],
+        "weight": 0.5, "lang": "fr", "description": "French: despair indicators"
+    },
+
+    # German (de)
+    "direct_suicidal_de": {
+        "patterns": [
+            r"(?:ich\s+(?:will|möchte|denke\s+(?:über|an)|plane))\s+(?:sterben|suizid|mich\s+(?:umbringen|töten))",
+            r"suizid|selbstmord",
+            r"(?:ich\s+(?:will|möchte)\s+(?:nicht|mehr\s+nicht))\s+(?:leben|weiterleben|existieren|dasein)",
+            r"(?:mit\s+)?(?:allem|dem\s+Leben|mir\s+selbst)\s+(?:aufhören|Schluss|fertig)\s+(?:sein|machen)",
+            r"(?:niemand|keiner)\s+(?:würde|wird)\s+(?:mich\s+)?(?:vermissen|bemerken|verlieren)",
+            r"(?:mein|dieses)\s+Leben\s+(?:hat\s+(?:keinen\s+)?Sinn|ist\s+(?:sinnlos|vorbei|fertig))",
+            r"(?:allen|jedem)\s+(?:wäre|ginge|ging)\s+es\s+besser\s+(?:ohne\s+mich|wenn\s+ich\s+nicht\s+wäre)",
+        ],
+        "weight": 1.0, "lang": "de", "description": "German: direct suicidal ideation"
+    },
+    "method_seeking_de": {
+        "patterns": [
+            r"(?:wie|welcher|beste)\s+(?:kann\s+ich|möglichkeit)\s+(?:mich\s+)?(?:umbringen|töten|sterben|suizid)",
+            r"(?:tödliche|letale|verhängnisvolle)\s+(?:Dosis|Menge)",
+            r"(?:Tabletten?|Medikamente?|Pillen?)\s+(?:um\s+)?(?:zu\s+)?(?:sterben|suizid|überdosis)",
+            r"(?:sich\s+)?(?:die\s+)?(?:Pulsadern|Kehle|Handgelenke?)\s+(?:aufschneiden|durchschneiden)",
+            r"(?:sich\s+)?(?:erhängen|aufhängen|vor\s+(?:einen\s+)?Zug\s+werfen|springen)",
+            r"(?:schmerzlose?|schnelle?)\s+(?:Art|Weise|Methode)\s+(?:zu\s+)?(?:sterben|suizid)",
+        ],
+        "weight": 1.0, "lang": "de", "description": "German: method seeking"
+    },
+    "despair_de": {
+        "patterns": [
+            r"(?:ich\s+(?:kann|schaffe|halte)\s+(?:es\s+)?(?:nicht\s+)?(?:mehr|weiter|länger))",
+            r"(?:ich\s+(?:bin|fühle\s+mich)\s+)?(?:verloren|einsam|leer|hoffnungslos|am\s+Ende)",
+            r"(?:es\s+gibt|es\s+hat)\s+(?:keine\s+)?(?:Hoffnung|Lösung|Auskunft|Sinn)",
+            r"(?:ich\s+bin|bin\s+ich)\s+(?:eine\s+)?(?:Belastung|Last|nutzlos|wertlos)",
+            r"(?:warum|wozu|für\s+wen)\s+(?:lebe|soll|mache)\s+(?:ich\s+)?(?:überhaupt|noch|weiter)",
+        ],
+        "weight": 0.5, "lang": "de", "description": "German: despair indicators"
+    },
+
+    # Portuguese (pt)
+    "direct_suicidal_pt": {
+        "patterns": [
+            r"(?:eu\s+(?:quero|preciso|vou|estou\s+pensando\s+em)|penso\s+em)\s+(?:morrer|me\s+matar|suicid[ai]r|acabar\s+com\s+tudo)",
+            r"suic[ií]dio",
+            r"(?:eu\s+)?(?:não\s+)?(?:quero|aguento|suporto|consigo)\s+(?:mais\s+)?(?:viver|existir|continuar|estar\s+aqui)",
+            r"(?:acabar|terminar|dar\s+fim)\s+(?:com\s+)?(?:tudo|a\s+minha\s+vida|com\s+isso|com\s+tudo)",
+            r"(?:ningu[eé]m)\s+(?:vai|iria)\s+(?:sentir\s+falta|notar|ligar|se\s+importar)",
+            r"(?:minha|esta)\s+vida\s+(?:não\s+)?(?:vale|faz\s+sentido|tem\s+sentido)",
+            r"(?:todo\s+mundo|todos)\s+(?:seria|estaria|ficaria)\s+(?:melhor|bem)\s+(?:sem\s+mim|se\s+eu\s+fosse)",
+        ],
+        "weight": 1.0, "lang": "pt", "description": "Portuguese: direct suicidal ideation"
+    },
+    "method_seeking_pt": {
+        "patterns": [
+            r"(?:como|qual|melhor\s+forma)\s+(?:de\s+)?(?:morrer|me\s+matar|suicid[ai]r|acabar)",
+            r"(?:dose|quantidade)\s+(?:letal|fatal|mortal)",
+            r"(?:comprimidos?|remédios?|medicamentos?)\s+(?:para\s+)?(?:morrer|me\s+matar|overdose)",
+            r"cort(?:ar|ando)\s+(?:os|meus)?\s+(?:pulsos|veias|garganta)",
+            r"(?:enforcar|enforcando|pendur[ae]r|pular)\s+(?:me|de|do|da)?",
+            r"(?:forma|maneira|método)\s+(?:indolor|rápido|sem\s+dor)\s+(?:de\s+)?(?:morrer|acabar)",
+        ],
+        "weight": 1.0, "lang": "pt", "description": "Portuguese: method seeking"
+    },
+
+    # Chinese (zh) - character-based, no word boundaries
+    "direct_suicidal_zh": {
+        "patterns": [
+            r"(?:想|想要|打算|计划|准备)(?:去)?(?:死|自杀|结束(?:自己的)?(?:生命|一切))",
+            r"(?:不想|不再|无法|不能)(?:活|活下去|继续活|生存)(?:了|下去)?",
+            r"(?:结束|终结)(?:自己|生命|一切|所有|全部)",
+            r"(?:没有|毫无|失去)(?:意义|希望|活下去的(?:理由|动力|勇气))",
+            r"(?:死了|不在了|消失了)(?:大家|所有人)(?:会|就)(?:更好|开心|轻松)",
+            r"(?:没有人|谁)(?:会)(?:在乎|在意|想|怀念)(?:我|我的)",
+            r"自杀",
+        ],
+        "weight": 1.0, "lang": "zh", "description": "Chinese: direct suicidal ideation"
+    },
+    "method_seeking_zh": {
+        "patterns": [
+            r"(?:怎么|怎样|什么(?:方法|方式))(?:才能|可以|去)?(?:死|自杀|结束(?:自己|生命))",
+            r"(?:致死|致命|致亡)(?:剂量|量|浓度|含量)",
+            r"(?:安眠药|药物|药片|毒药)(?:吃|服用|用)(?:多少|几|怎么)(?:才能|可以|会)?(?:死|自杀|致命)",
+            r"(?:割|切)(?:腕|脉|喉|脖子|血管)",
+            r"(?:上吊|跳楼|跳河|跳桥|跳崖|撞车)",
+            r"(?:无痛|最快|最简单)(?:的)?(?:死法|方法|方式)(?:是|用来)?",
+        ],
+        "weight": 1.0, "lang": "zh", "description": "Chinese: method seeking"
+    },
+    "despair_zh": {
+        "patterns": [
+            r"(?:撑|坚持|忍受|活)(?:不|没有|无法)(?:下去|了|再)",
+            r"(?:迷茫|孤独|空虚|绝望|崩溃|痛苦|无助)(?:了|到了|到)?",
+            r"(?:没有|失去|看不到)(?:希望|出路|未来|意义|目的)",
+            r"(?:我是|我是一个)(?:负担|累赘|废物|没用的人)",
+            r"(?:活着|生存)(?:为了什么|有什么意义|有什么用|有什么意思)",
+        ],
+        "weight": 0.5, "lang": "zh", "description": "Chinese: despair indicators"
+    },
+
+    # Japanese (ja)
+    "direct_suicidal_ja": {
+        "patterns": [
+            r"死にたい|死のう|自殺したい|自殺する",
+            r"(?:もう|これ以上)(?:生きて|生きる|存在して)(?:い(?:たい|る)|行(?:きたい|く))(?:く|け)(?:ない|たくない)?",
+            r"(?:すべて|全部|人生|この(?:まま|こと))(?:を)?(?:終わり|終え|やめ)(?:たい|よう|る)",
+            r"(?:誰も|だれも)(?:気づ|気付|構い|構って|思っ)(?:て(?:くれ|い)ない|てくれ(?:ない))",
+            r"(?:僕|俺|私|わたし)(?:が|は)(?:い(?:ない|なくなって)|消(?:え|えても))(?:も|たら)(?:皆|みんな|周囲)(?:は)?(?:良(?:い|く)|楽(?:に))(?:なる|なった)",
+            r"(?:この|今の)(?:僕|俺|私|わたし)(?:の)?(?:人生|命|存在)(?:は)?(?:意味|価値|甲斐)(?:が)?(?:ない|無い)",
+        ],
+        "weight": 1.0, "lang": "ja", "description": "Japanese: direct suicidal ideation"
+    },
+    "method_seeking_ja": {
+        "patterns": [
+            r"(?:どう|どんな|どの(?:よう|様)?に)(?:すれば|やれば|して)(?:死|自殺|亡くな)(?:れる|りたい|る)",
+            r"(?:致死|致命)(?:量|的(?:な)?(?:量|ドーズ|用量))",
+            r"(?:睡眠薬|薬|ピル|毒)(?:を)?(?:何|いくつ|どのくらい)(?:飲|摂|使)(?:め|んだら|えば)(?:死|亡くな)(?:れる|る)",
+            r"(?:手首|喉|首筋|血管)(?:を)?(?:切|斬|傷つ)(?:る|け|って)",
+            r"(?:縊|首吊|飛び降|投身|飛び降り)(?:り|て|死の)",
+            r"(?:苦痛|痛み)(?:の)?(?:ない|少ない)(?:方法|やり方|死に方)(?:で|は)?",
+        ],
+        "weight": 1.0, "lang": "ja", "description": "Japanese: method seeking"
+    },
+    "despair_ja": {
+        "patterns": [
+            r"(?:もう|これ以上|これ以上は)(?:無理|限界|耐え|がんば|頑張)(?:だ|だよ|れない|りきれない)",
+            r"(?:孤独|寂し|虚し|絶望|疲(?:れ|労))(?:い|く|き|さ|た|すぎて)",
+            r"(?:希望|未来|生き(?:甲斐|がい)|意味|目的)(?:が|は)?(?:ない|無い|見え|見つから|失(?:くし|われ))",
+            r"(?:僕|俺|私|わたし)(?:は|が)?(?:邪魔|迷惑|足手まとい|重荷|役に立たない)",
+            r"(?:生き(?:る|ている)|存在(?:する|している))(?:の(?:に)?|こと(?:に)?)(?:は)?(?:何の|なんの|どんな)(?:ため|意味|価値)",
+        ],
+        "weight": 0.5, "lang": "ja", "description": "Japanese: despair indicators"
+    },
+}
+
+
+def _check_multilingual(text):
+    """Check text against all multilingual crisis patterns."""
+    matches = []
+    languages = set()
+    total_score = 0.0
+    max_possible = 0.0
+
+    for category, config in MULTILINGUAL_CRISIS_PATTERNS.items():
+        weight = config.get("weight", 1.0)
+        lang = config.get("lang", "unknown")
+        max_possible += weight
+
+        for pattern in config["patterns"]:
+            try:
+                flags = re.IGNORECASE if lang in ("es", "fr", "de", "pt") else 0
+                if re.search(pattern, text, flags):
+                    matches.append({"category": category, "lang": lang, "weight": weight})
+                    total_score += weight
+                    languages.add(lang)
+                    break
+            except re.error:
+                pass
+
+    score = total_score / max_possible if max_possible > 0 else 0.0
+    return {
+        "crisis_detected": score >= 0.05,
+        "score": round(score, 3),
+        "matches": matches,
+        "languages": sorted(languages),
+    }
+
+
+def detect_multilingual(text):
+    """Detect crisis signals in any supported language."""
+    result = _check_multilingual(text)
+    if result["matches"]:
+        result["highest_category"] = max(result["matches"], key=lambda m: m["weight"])["category"]
+    else:
+        result["highest_category"] = None
+    return result
+
+
+if __name__ == "__main__":
+    tests = [
+        ("quiero morir", True, "es"), ("je veux me suicider", True, "fr"),
+        ("ich will nicht mehr leben", True, "de"), ("eu quero me matar", True, "pt"),
+        ("我想死", True, "zh"), ("死にたい", True, "ja"),
+        ("no puedo mas, quiero acabar con todo", True, "es"),
+        ("personne ne me manquera", True, "fr"), ("dosis letal", True, "es"),
+        ("怎么自杀", True, "zh"), ("en finir avec tout", True, "fr"),
+        ("hola, como estas?", False, None), ("je suis fatigue", False, None),
+        ("今天的天气不错", False, None), ("おはようございます", False, None),
+    ]
+    passed = sum(1 for text, should, _ in tests if detect_multilingual(text)["crisis_detected"] == should)
+    print(f"{passed}/{len(tests)} passed")