Add Url variant to AgentDesiredModel for generic HTTP model downloads

[mcharytoniuk]

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[Copilot]

Pull request overview

This PR adds a new Url variant for desired models so agents can download GGUF models from generic HTTP URLs, with cache resolution, status reporting, client schema updates, and integration tests.

Changes:

• Adds Rust model-source abstraction and URL-backed model resolution/cache download support.
• Extends shared types, Python/JavaScript schemas, GUI display, and admin UI conversion for AgentDesiredModel::Url.
• Adds cache-dir helpers, URL model tests, and subprocess integration tests for URL desired state and 404 reporting.

Reviewed changes

Copilot reviewed 28 out of 29 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
resources/ts/components/ChangeModelPage.tsx	Displays Url desired models in the model form.
paddler/src/resolves_model_source.rs	Adds a common async model-source resolution trait.
paddler/src/resolve_desired_model.rs	Routes Hugging Face, local, URL, and none variants through resolvers.
paddler/src/paddler_cache_dir.rs	Adds cache-directory resolution from env/XDG/HOME.
paddler/src/model_source/url.rs	Implements URL model cache pathing, download, status updates, and tests.
paddler/src/model_source/mod.rs	Exposes model-source modules.
paddler/src/model_source/local.rs	Moves local-path resolution into a resolver type.
paddler/src/model_source/huggingface.rs	Moves Hugging Face download resolution into a resolver implementation.
paddler/src/lib.rs	Updates exported modules for the new resolver structure.
paddler/src/download_huggingface_model.rs	Removes the old standalone Hugging Face downloader module.
paddler/src/desired_model_resolution.rs	Adds Debug for resolution values.
paddler/src/agent_issue_fix.rs	Adds URL model issue-fix handling and tests.
paddler/Cargo.toml	Adds sha2 to paddler dependencies.
paddler_types/src/url_model_reference.rs	Adds the shared URL model reference type.
paddler_types/src/lib.rs	Exports the URL model reference module.
paddler_types/src/agent_issue.rs	Adds URL model issue variants.
paddler_types/src/agent_desired_model.rs	Adds the Url desired model variant.
paddler_tests/tests/balancer_reports_url_model_not_found.rs	Adds subprocess coverage for URL 404 issue reporting.
paddler_tests/tests/balancer_persists_url_model_in_desired_state.rs	Adds subprocess coverage for persisted URL desired state.
paddler_tests/src/local_http_fixture.rs	Adds a reusable local HTTP fixture for tests.
paddler_tests/src/lib.rs	Exports the local HTTP fixture.
paddler_gui/src/ui/view_running_balancer.rs	Displays URL desired models in the GUI.
paddler_client_python/tests/test_agent_desired_model.py	Adds Python serialization/deserialization tests for URL models.
paddler_client_python/paddler_client/url_model_reference.py	Adds Python URL model reference type.
paddler_client_python/paddler_client/agent_desired_model.py	Adds Python client support for the Url variant.
paddler_client_javascript/src/schemas/UrlModelReference.ts	Adds JavaScript schema/type for URL model references.
paddler_client_javascript/src/schemas/AgentDesiredModel.ts	Adds JavaScript schema support for the Url variant.
Cargo.toml	Adds workspace sha2 dependency.
Cargo.lock	Records sha2 as a paddler dependency.

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[Copilot]

Pull request overview

Copilot reviewed 76 out of 78 changed files in this pull request and generated 11 comments.

[Copilot]

Pull request overview

Copilot reviewed 76 out of 78 changed files in this pull request and generated 12 comments.

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Pull request overview

Copilot reviewed 83 out of 85 changed files in this pull request and generated 3 comments.

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Pull request overview

Copilot reviewed 87 out of 89 changed files in this pull request and generated 2 comments.

[Copilot]

Pull request overview

Copilot reviewed 87 out of 89 changed files in this pull request and generated 1 comment.