Cloud Agent: check /enabled

[joshspicer]

fixes microsoft/vscode#279098
ctx https://vscodeteam.slack.com/archives/C04PKH0BDQS/p1769541405028749

Implements /agents/swe/jobs/{owner}/{repo}/enabled

• Friendlier messages, eg:

• Does not continue fetching against other endpoints (/models) if 401/403/422 returned

[Copilot]

Pull request overview

This PR implements the /agents/swe/jobs/{owner}/{repo}/enabled endpoint check to provide better user experience when the Copilot cloud agent (CCA) is disabled for a repository. It adds early validation with friendlier error messages and prevents unnecessary API calls to other endpoints when access is denied.

Changes:

• Adds isCCAEnabled method to check CCA availability before operations
• Implements caching of CCA enabled status per repository
• Provides user-friendly error messages for different failure scenarios (401/403/422)
• Early returns in provideChatSessionProviderOptions to avoid fetching models/agents when CCA is disabled

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/platform/github/common/githubService.ts	Adds CCAEnabledResult interface and isCCAEnabled method signature to IOctoKitService
src/platform/github/common/octoKitServiceImpl.ts	Implements isCCAEnabled method that calls the new endpoint and handles status codes
src/extension/chatSessions/vscode-node/copilotCloudSessionsProvider.ts	Integrates CCA enabled check with caching, provides friendly error messages, and implements early exit when disabled
src/extension/agents/vscode-node/test/mockOctoKitService.ts	Updates mock to include isCCAEnabled method returning enabled by default
package.json	Updates @vscode/copilot-api from 0.2.9 to 0.2.12 to support new RequestType.CopilotAgentJobEnabled
package-lock.json	Reflects the dependency version update