Add FileResourceContents for file-based resource results#225
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Introduce FileResourceContents type that allows resource functions to return file paths instead of manually reading files. The framework handles file I/O and text/binary detection automatically. New types: - FileResourceContents: public model with Path (required) and MimeType (optional) - FunctionsMcpResourceResultMiddleware: reads files and converts to TextResourceContents or BlobResourceContents based on MIME type - MimeTypeHelper: determines text vs binary encoding from MIME type - McpResourceResult: SDK-side model matching host's expected shape Features: - Relative paths resolved against AppContext.BaseDirectory automatically - MIME-based encoding: text/* and application/json,xml,js → UTF-8 text; structured suffixes (+json, +xml) → text; everything else → base64 blob - Falls back to attribute MimeType from binding context when not set - Null/empty MIME type defaults to text Closes #158 Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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…HelperTests - Seal FileResourceContents to match codebase conventions - Revert WorkerMcpJsonContext rename back to McpJsonContext - Extract MimeTypeHelper tests into dedicated test class - Add test for lowercase mimeType binding data key Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Issue describing the changes in this PR
resolves #158
Pull request checklist
release_notes.mdAdditional information
Introduces FileResourceContents, a new return type for resource functions that abstracts away file I/O. Instead of manually reading files with
Path.Combine(AppContext.BaseDirectory, ...)+File.ReadAllText/ReadAllBytes, users return a FileResourceContents with just a Path — the framework handles the rest.