feat: support build with unknown type

[aftersnow]

No description provided.

[gemini-code-assist]

Summary of Changes

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This pull request refines the modelfile generation process from a workspace directory. It removes the option to ignore unrecognized file types, opting instead for a size-based heuristic to classify unknown files as either model weights or code. Additionally, it introduces validation and size/count limits for the workspace to prevent issues with overly large or complex directories.

Highlights

• Unknown File Type Handling: The --ignore-unrecognized-file-types flag and corresponding internal logic have been deprecated. Instead of ignoring or erroring on unknown file types during workspace scanning, the generator now attempts to classify them based on size: files larger than 128MB are treated as potential model weight files, while smaller unknown files are added to the code list.
• Workspace Validation and Limits: Added initial validation for the workspace directory to ensure it exists, is a directory (not a symlink), and is not empty. New limits are introduced for the workspace: a single file cannot exceed 128GB, the total number of files cannot exceed 1024, and the total workspace size cannot exceed 8TB.
• Expanded Recognized File Types: Significantly expanded the lists of recognized file extensions for configuration, model, code, and documentation files to include a wider variety of common formats used in ML and software development.

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[gemini-code-assist]

Code Review

This pull request introduces support for building modelfiles even with unknown file types, adds comprehensive workspace validation, and imposes limits on file size and workspace size. It also expands the list of recognized file patterns and deprecates the ignore-unrecognized-file-types flag.

[aftersnow]

#210