feat: add multi-engine regex flavour support

public/engines/python/engine-metadata.json

@@ -8,13 +8,14 @@
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     "regexModule": "re",
     "supportModules": {
       "serialization": "json",
+      "replacementOutputEncoding": "canonical RFC 4648 base64",
       "runtimeIdentity": "sys"
     },
     "maximumPatternUtf16": 65536,
@@ -27,6 +28,11 @@
     "maximumNativeExpansionCodePoints": 16777216
   },
   "source": {
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@@ -57,19 +63,125 @@
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     "externalPackagesIncluded": false,
+    "legalClosure": "SOURCE-MANIFEST.json inventories every loader and native base-runtime component, exact preferred-form input and patch, plus independently anchored legal text.",
     "lockPythonVersionNote": "The upstream lock's 3.14.0 field identifies its CPython 3.14 ABI baseline; the executable runtime self-identifies as 3.14.2."
   },
   "files": [
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