feat(iace): scenario-based matching + split benchmark_synonyms.go

4-signal matcher: category (0.2), keywords (0.2), zone (0.3),
scenario similarity (0.3). Scenario signal extracts action words
(eingeklemmt vs herabfallend vs durchschlaegt) to differentiate
similar-looking hazards at the same component.

Split benchmark_synonyms.go (70 lines) from benchmark_matcher.go
(516→450 lines) to stay under 500-line cap.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ai-compliance-sdk/internal/iace/benchmark_synonyms.go

@@ -0,0 +1,68 @@
+package iace
+
+// synonymSets groups equivalent hazard terms for keyword matching.
+var synonymSets = [][]string{
+	{"quetsch", "crush", "einklemm", "klemm"},
+	{"scher", "shear", "absch"},
+	{"schneid", "cut", "schnitt"},
+	{"stoss", "schlag", "impact", "treff", "aufprall"},
+	{"einzug", "fang", "erfass", "entangle", "wickel"},
+	{"elektrisch", "stromschlag", "electric", "beruehr", "spannungsfuehr", "koerperdurchstroemung"},
+	{"brand", "feuer", "fire", "kabelbrand", "kurzschluss", "ueberlast", "ueberstrom"},
+	{"verbrenn", "burn", "heiss", "thermisch", "lichtbogen"},
+	{"laerm", "noise", "gehoer", "schall", "dezibel"},
+	{"vibration", "schwing"},
+	{"ergonom", "haltung", "handhabung", "bedien", "bewegungsapparat"},
+	{"kuehlschmierstoff", "kss", "aerosol", "coolant"},
+	{"pneumat", "druckluft", "compressed"},
+	{"hydraul", "druck", "pressure"},
+	{"roboter", "robot", "roboterarm"},
+	{"greifer", "gripper", "schunk"},
+	{"foerderband", "transport", "conveyor"},
+	{"schutzzaun", "schutzgitter", "fence", "guard"},
+	{"werkzeugmaschine", "robodrill", "bearbeitungszentrum", "wzm"},
+	{"stolper", "rutsch", "slip", "trip"},
+	{"leckage", "austreten", "leak"},
+	{"einstich", "puncture", "spritz"},
+	{"isolat", "kriechstrom", "schutzleiter", "erdung", "indirekt"},
+	{"luft", "kriechstreck", "beruehrer", "oberflaeche", "leitfaehig"},
+	{"emv", "strahlung", "radiation", "elektromagnet", "stoereinfluss"},
+	{"eingeschlossen", "eingesperrt", "wiederanlauf", "quittier"},
+	{"zentriergreifer", "zentriereinheit", "zentrieren"},
+	{"beladetuer", "schutztuer", "zugangstuer", "tuerposition"},
+	{"werkstueck", "rohteil", "rohling"},
+	{"ergonom", "einlege", "bedienelemente", "arbeitshoehe", "haltung"},
+	{"boden", "tragfaehig", "einbrech", "fundamentierr"},
+	{"spritzer", "auge", "augenverletz"},
+	{"bersten", "platzen", "abspring"},
+	{"durchschlag", "durchbrech", "begrenz", "bewegungsbereich"},
+	{"potentialausgleich", "potentialunter", "bezugspotential"},
+	{"kriechstreck", "luft-", "kriechst", "dimensionie"},
+	{"kuehlschmierstoff", "kss", "bettspuel", "kuehlung"},
+	{"rutsch", "ausrutsch", "stolper", "gleiten", "nassrutsch"},
+}
+
+// wrongMachineTerms are words in an engine hazard that indicate it's about
+// a completely different machine type.
+var wrongMachineTerms = []string{
+	"spielplatz", "fahrtreppe", "trommelwaschmaschine", "umreifungsband",
+	"drehteller", "rundtaktanlage", "exzentrisch", "webstuhl",
+	"aufzug", "rolltreppe", "bagger", "kettensaege", "kreissaege",
+	"druckmaschine", "zentrifuge", "autoklav", "hobel",
+	"naehmaschine", "strickmaschine", "schleifmaschine",
+	"gabelstapler", "flurfoerder", "erntemaschine",
+	"kollision zweier roboter",
+}
+
+// categoryMap maps GT hazard_group (German) to engine category prefixes.
+var categoryMap = map[string][]string{
+	"mechanische gefaehrdungen":                              {"mechanical"},
+	"elektrische gefaehrdungen":                              {"electrical"},
+	"thermische gefaehrdungen":                               {"thermal"},
+	"gefaehrdungen durch laerm":                              {"noise", "ergonomic"},
+	"gefaehrdungen durch vibration":                          {"noise", "vibration"},
+	"gefaehrdungen durch strahlung":                          {"radiation", "emc"},
+	"gefaehrdungen durch materialien und substanzen":         {"material", "environmental"},
+	"ergonomische gefaehrdungen":                             {"ergonomic"},
+	"gefaehrdungen im zusammenhang mit der einsatzumgebung":  {"environmental"},
+}