feat: add --toolset/-t option to vlmrun chat CLI

[devin-ai-integration]

Summary

Adds a repeatable --toolset / -t CLI option to vlmrun chat that lets users specify which tool categories the Orion agent should have access to during a chat session. The toolsets are validated against the AgentToolset literal type and passed via extra_body["toolsets"] to the OpenAI-compatible chat completions endpoint.

Also fixes the AgentToolset literal in types.py to use "world-gen" (hyphen) instead of "world_gen" (underscore), matching the API docs. The same rename is applied to the docstring in agent.py.

Bumps package version to 0.5.8.

Example usage:

vlmrun chat "Describe this" -i photo.jpg -t web -t image
vlmrun chat "Generate a chart" -t viz -t image-gen

Review & Testing Checklist for Human

• Verify world-gen rename is backward-compatible: AgentToolset was changed from "world_gen" to "world-gen". Confirm the server accepts "world-gen" and that no other SDK consumers (e.g. users passing toolsets=["world_gen"] to client.agent.execute()) will break.
• Test end-to-end: Run vlmrun chat "what can you do?" -t web -t core with a valid API key and confirm the toolsets appear in the request and are respected in the response behavior.
• Verify AgentToolset.__args__ stability: The AVAILABLE_TOOLSETS list is derived from Literal.__args__, which works on Python 3.9–3.12 but is not a documented public API. Confirm this is acceptable or consider using get_args() from typing.

Notes

• No new tests were added; the existing 296 tests continue to pass across Python 3.9–3.12.
• The hardcoded toolset names in the --help text could drift from AgentToolset.__args__ if the type is updated — a minor maintenance concern.

Link to Devin session: https://app.devin.ai/sessions/74e0d8fb30974dc3938dd63f5eb22ae8
Requested by: @spillai

[devin-ai-integration]

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[spillai]

Update the references for world_gen to world-gen and image-gen appropriately.

[spillai]

Bump up the patch version.