fix(remote-a2a): fall back to folder context when folder_path is missing

[radugheo]

• RemoteA2aService._retrieve_spec now resolves the folder through a _resolve_folder_key helper that mirrors McpService: when no folder_path is provided it falls back to the FolderContext instead of raising Cannot obtain folder_key without providing folder_path.
• Enables A2A runs without the UIPATH_FOLDER_PATH env var (e.g. uipath debug with no UIPATH_FOLDER_PATH and no resource override)
• Adds A2A service tests for both the fallback and the explicit-folder paths.
• Bumps uipath-platform to 0.1.75 and uipath to 2.11.12.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[Copilot]

Pull request overview

This PR fixes Remote A2A agent retrieval so that when folder_path is not provided it no longer raises, and instead falls back to the folder context (mirroring the existing McpService behavior). This unblocks local A2A runs (e.g., uipath debug) where UIPATH_FOLDER_PATH is unset and no explicit resource override is provided.

Changes:

• Add RemoteA2aService._resolve_folder_key() and use it in _retrieve_spec() to fall back to FolderContext when folder_path is missing.
• Add unit tests covering both the fallback-to-context behavior and the explicit folder_path resolution path.
• Bump package versions: uipath-platform → 0.1.75, uipath → 2.11.12, and update both uv.lock files accordingly.

Reviewed changes

Copilot reviewed 4 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
packages/uipath/uv.lock	Updates lockfile to reflect the new uipath / uipath-platform versions and refreshed resolution metadata.
packages/uipath/pyproject.toml	Bumps uipath version and raises minimum uipath-platform dependency to >=0.1.75.
packages/uipath-platform/uv.lock	Updates uipath-platform lockfile for the new version and refreshed resolution metadata.
packages/uipath-platform/tests/services/test_remote_a2a_service.py	Adds regression coverage for _retrieve_spec() folder key resolution (fallback vs explicit).
packages/uipath-platform/src/uipath/platform/agenthub/_remote_a2a_service.py	Implements _resolve_folder_key() and uses it to avoid raising when folder_path is missing.
packages/uipath-platform/pyproject.toml	Bumps uipath-platform version to 0.1.75.

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[radu-mocanu]

Golden-rule review

Reviewed the remote-a2a folder fallback change against the golden rules. The version bumps, lock files, and tests are consistent with the rules. No golden-rule violations found.

No golden-rule violations found.