feat(c2pa): expand soft-binding vendor map with registry-verified algs

Adds Trufo, Overlai, MarkAny, Mentaport, LumaTrace, VerdaAI, ContentLens, ISCC
(io.iscc content code), and Adobe ICN fingerprint to C2PA_SOFT_BINDINGS, and
notes AIWatermark wraps Meta PixelSeal. All `alg` prefixes verified against the
official c2pa-org/softbinding-algorithm-list registry.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/remove_ai_watermarks/noai/constants.py

@@ -132,6 +132,7 @@ C2PA_AI_TOOLS = {
 # the rest (Digimarc, Imatag, Steg.AI, etc.) are proprietary oracle-only decoders.
 C2PA_SOFT_BINDINGS = {
     b"com.adobe.trustmark": "Adobe TrustMark",
+    b"com.adobe.icn": "Adobe (content fingerprint)",
     b"com.digimarc": "Digimarc",
     b"com.imatag.lamark": "Imatag (Lamark)",
     b"ai.steg": "Steg.AI",
@@ -139,7 +140,15 @@ C2PA_SOFT_BINDINGS = {
     b"com.microsoft.wavmark": "Microsoft WavMark",
     b"com.verimatrix": "Verimatrix",
     b"com.nagra.nexguard": "NAGRA NexGuard",
-    b"com.aiwatermark": "AIWatermark",
+    b"com.aiwatermark": "AIWatermark (Meta PixelSeal)",
+    b"ai.trufo": "Trufo",
+    b"app.overlai": "Overlai",
+    b"com.markany": "MarkAny",
+    b"com.mentaport": "Mentaport",
+    b"es.lumatrace": "LumaTrace",
+    b"ai.verda": "VerdaAI",
+    b"ai.contentlens": "ContentLens",
+    b"io.iscc": "ISCC (content code)",
 }
 
 # Lowercased substrings that mark an AI generator when found in an EXIF

tests/test_metadata.py

@@ -579,6 +579,9 @@ class TestSoftBinding:
         assert soft_binding_vendors_in(b"...alg...com.adobe.trustmark.P...") == ["Adobe TrustMark"]
         assert soft_binding_vendors_in(b"com.digimarc.validate.1") == ["Digimarc"]
         assert soft_binding_vendors_in(b"ai.steg.api blah") == ["Steg.AI"]
+        # Registry-verified vendors added in v0.6.x.
+        assert soft_binding_vendors_in(b"ai.trufo.gen1.image") == ["Trufo"]
+        assert soft_binding_vendors_in(b"io.iscc.v0") == ["ISCC (content code)"]
 
     def test_vendors_in_empty_when_absent(self):
         from remove_ai_watermarks.noai.c2pa import soft_binding_vendors_in