feat(copilotcli): add WorktreeSessionIndex for managing chat session entries with JSONL persistence

[DonJayamanne]

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[github-actions]

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Changed (3)

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[Copilot]

Pull request overview

This PR introduces a new persistence and indexing layer for Copilot CLI chat session metadata to better support cross-process visibility and scalable storage (shared bulk cache + JSONL worktree index), including migrations from legacy storage locations.

Changes:

• Add WorktreeSessionIndex with JSONL persistence for worktree-folder → session-id lookups.
• Update ChatSessionMetadataStore to use a shared bulk cache file in ~/.copilot/, add refresh(), and implement last-modified-wins merging + top-N trimming.
• Extend/adjust tests and integrations to exercise refresh, migration, JSONL behavior, and stale-cache safety.

Show a summary per file

File	Description
extensions/copilot/src/extension/chatSessions/vscode-node/worktreeSessionIndex.ts	New in-memory + JSONL-persisted index for worktree session lookups.
extensions/copilot/src/extension/chatSessions/vscode-node/test/worktreeSessionIndex.spec.ts	Unit tests for WorktreeSessionIndex in-memory ops and JSONL persistence.
extensions/copilot/src/extension/chatSessions/vscode-node/test/chatSessionMetadataStoreImpl.spec.ts	Major test updates/additions for shared bulk cache, refresh, migration, JSONL index, trim, and merge behavior.
extensions/copilot/src/extension/chatSessions/vscode-node/copilotCLIChatSessionsContribution.ts	Calls metadata refresh() on session list changes/refresh actions.
extensions/copilot/src/extension/chatSessions/vscode-node/copilotCLIChatSessions.ts	Triggers metadata refresh() during session list refresh.
extensions/copilot/src/extension/chatSessions/vscode-node/chatSessionWorktreeServiceImpl.ts	Stops using legacy globalState storage for worktrees (clears key) and routes persistence through metadata store.
extensions/copilot/src/extension/chatSessions/vscode-node/chatSessionMetadataStoreImpl.ts	Implements shared bulk cache, refresh, migration, JSONL top-up + session-state scan, and timestamping/merge semantics.
extensions/copilot/src/extension/chatSessions/copilotcli/node/cliHelpers.ts	Adds helpers for shared bulk cache + worktree JSONL paths under ~/.copilot/.
extensions/copilot/src/extension/chatSessions/common/test/mockChatSessionMetadataStore.ts	Adds refresh() no-op to mock store interface.
extensions/copilot/src/extension/chatSessions/common/chatSessionMetadataStore.ts	Adds created/modified, defines WorktreeSessionEntry, and adds refresh() to the store interface.

Copilot's findings

• Files reviewed: 10/10 changed files
• Comments generated: 8