agents: group worktree sessions by repository root

[cavokz]

Fixes #312729

Problem

Sessions from user-created git worktrees (at arbitrary paths) appeared as separate groups in the Agents Sessions list. Each worktree had a different workingDirectoryPath in session metadata, which the viewer used for grouping — so each worktree produced its own group even though they belong to the same repository.

Fix

_buildMetadata() in AgentHostSessionListController now also emits repositoryPath from project.uri (the git repository root, resolved by the Copilot agent at session-creation time via resolveGitProject()).

The viewer's getRepositoryName() already checks repositoryPath before workingDirectoryPath, so sessions sharing the same repo root now collapse into a single group regardless of which worktree they ran in. No changes to the viewer were needed.

Both URI schemes are handled:

• Local sessions: file:// project URI → fsPath used directly as repositoryPath
• Remote sessions: vscode-agent-host://server/file/-/path URI (as wrapped by remoteAgentHostProtocolClient) → unwrapped via fromAgentHostUri() to extract the remote path

Tests

• agentHostChatContribution.test.ts: verifies repositoryPath is set from project.uri for local sessions, and that remote (vscode-agent-host://) project URIs are unwrapped correctly
• agentSessionsDataSource.test.ts: verifies that 3 sessions with the same repositoryPath but different workingDirectoryPath values are grouped into a single repository group

[Copilot]

Pull request overview

This PR fixes incorrect grouping of Agent sessions created from user-managed Git worktrees by ensuring session metadata includes a stable repository-root path (repositoryPath) derived from the Copilot agent’s resolved project URI.

Changes:

• Emit repositoryPath in AgentHostSessionListController metadata based on project.uri, handling both local file:// and remote vscode-agent-host:// URIs.
• Add unit tests verifying repositoryPath is populated correctly for local and remote sessions.
• Add a grouping test ensuring sessions with the same repositoryPath (but different worktree workingDirectoryPaths) collapse into a single repository group.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/vs/workbench/contrib/chat/browser/agentSessions/agentHost/agentHostSessionListController.ts	Adds repositoryPath to emitted session metadata by resolving/unwrapping project URIs.
src/vs/workbench/contrib/chat/test/browser/agentSessions/agentHostChatContribution.test.ts	Tests metadata generation for repositoryPath in both local and remote URI cases.
src/vs/workbench/contrib/chat/test/browser/agentSessions/agentSessionsDataSource.test.ts	Tests repository grouping behavior when multiple worktrees share the same repositoryPath.

[cavokz]

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