fix(agentstack-cli): support platform files in --dump-files

[JanPokorny]

Summary

Linked Issues

Fixes #1285

Documentation

• No Docs Needed:

If this PR adds new feature or changes existing. Make sure documentation is adjusted accordingly. If the docs is not needed, please explain why.

[gemini-code-assist]

Summary of Changes

Hello @JanPokorny, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request resolves an issue in the agentstack-cli's --dump-files functionality by enhancing its ability to handle various Uniform Resource Identifiers (URIs). It introduces specific logic to recognize and correctly load files referenced by agentstack:// URIs, which are internal to the platform. Additionally, it refines the handling of external HTTP/HTTPS URIs by removing an erroneous base64 decoding step, ensuring accurate file content retrieval and saving.

Highlights

• Platform File URI Support: The agentstack-cli now correctly processes platform-specific agentstack:// URIs when using the --dump-files command, enabling proper retrieval of internal platform files.
• Refined URI Handling Logic: The _run_agent function has been updated to differentiate between agentstack:// URIs and external HTTP/HTTPS URIs, applying appropriate fetching mechanisms for each.
• Removed Unnecessary Base64 Decoding: An incorrect base64.b64decode call has been removed for content fetched from external HTTP/HTTPS URIs, ensuring that file content is written directly as bytes.

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[gemini-code-assist]

Code Review

This pull request enhances the --dump-files functionality by adding support for platform-native files using agentstack:// URIs. It also corrects a bug in handling generic HTTP URIs where file content was being incorrectly base64-decoded. My review identifies a minor performance improvement opportunity by reusing the httpx.AsyncClient across multiple file downloads within a single agent run.