feat: add multi-engine regex flavour support

public/engines/dotnet/LICENSE-dotnet.txt

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+The MIT License (MIT)
+
+Copyright (c) .NET Foundation and Contributors
+
+All rights reserved.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

public/engines/dotnet/SHA256SUMS

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public/engines/dotnet/engine-metadata.json

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+  "engine": "dotnet",
+  "engineName": "System.Text.RegularExpressions",
+  "engineVersion": ".NET 10.0.10 System.Text.RegularExpressions",
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+  "status": "production-native-runtime",
+  "bridge": {
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+    "supportedApplicationFlags": [
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+    "target": "browser-wasm",
+    "command": "dotnet publish engines/dotnet/RegexTools.DotNet.csproj -c Release --no-restore -p:PathMap=<source>=/regex-tools-source -p:EmccExtraCFlags=-ffile-prefix-map=<sdk>=/dotnet-sdk-10.0.302"
+  },
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