Refactor chat session worktree handling and remove unused components

[DonJayamanne]

Co-authored-by: Copilot copilot@github.com

[github-actions]

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chat/aiCustomizations/aiCustomizationManagementEditor/McpBrowseMode/Dark

Before	After

[Copilot]

Pull request overview

Refactors Copilot CLI chat session worktree/session-folder association by removing the persisted JSONL worktree index and related APIs, and replacing the “folder ↔ session” lookup with an in-memory working-directory store used by session providers and repository tracking.

Changes:

• Removed JSONL-backed WorktreeSessionIndex and the associated metadata-store behaviors/tests.
• Simplified getWorktreeProperties APIs to be session-id-only (removed folder-based overloads / sessionId-for-worktree lookup).
• Added ISessionWorkingDirectoryStore and wired it into session item/content providers and worktree commit/cache invalidation paths.

Show a summary per file

File	Description
extensions/copilot/src/extension/chatSessions/vscode-node/worktreeSessionIndex.ts	Deletes JSONL-backed worktree/session index implementation.
extensions/copilot/src/extension/chatSessions/vscode-node/test/chatSessionMetadataStoreImpl.spec.ts	Removes tests covering JSONL index + folder-based worktree lookup/scan behavior.
extensions/copilot/src/extension/chatSessions/vscode-node/copilotCLIChatSessionsContribution.ts	Uses working-directory store for associating worktrees with sessions; adjusts cached-changes gating.
extensions/copilot/src/extension/chatSessions/vscode-node/copilotCLIChatSessions.ts	Same association + cache invalidation changes for the controller-based provider.
extensions/copilot/src/extension/chatSessions/vscode-node/chatSessions.ts	Registers the new working-directory store service in relevant child instantiation services.
extensions/copilot/src/extension/chatSessions/vscode-node/chatSessionWorktreeServiceImpl.ts	Removes folder-based worktree property lookup and sessionId-for-worktree helper.
extensions/copilot/src/extension/chatSessions/vscode-node/chatSessionRepositoryTracker.ts	Uses working-directory store to find sessions affected by repo state changes.
extensions/copilot/src/extension/chatSessions/vscode-node/chatSessionMetadataStoreImpl.ts	Removes JSONL maintenance/top-up and session-state scan logic.
extensions/copilot/src/extension/chatSessions/copilotcli/node/cliHelpers.ts	Removes getCopilotWorktreeSessionsFile helper.
extensions/copilot/src/extension/chatSessions/common/test/mockChatSessionMetadataStore.ts	Updates mock metadata store API to session-id-only worktree lookup.
extensions/copilot/src/extension/chatSessions/common/sessionWorkingDirectoryStore.ts	Introduces in-memory session-id ↔ folder association store service.
extensions/copilot/src/extension/chatSessions/common/chatSessionWorktreeService.ts	Updates worktree service interface (removes folder overload + sessionId-for-worktree).
extensions/copilot/src/extension/chatSessions/common/chatSessionMetadataStore.ts	Updates metadata store interface (removes folder-based worktree lookup + sessionId-for-worktree).

Copilot's findings

• Files reviewed: 13/13 changed files
• Comments generated: 5