[help wanted] write a ToolSpec for Copilot Chat in VS Code

[rohitsux]

Copilot in VS Code stores chat sessions under ~/Library/Application Support/Code/User/workspaceStorage/<hash>/chatSessions/*.json on macOS (Linux: ~/.config/Code/User/...). Copilot's persistence has shifted multiple times in 2025–2026 — confirm current layout on the latest Copilot Chat extension.

Deliverable: confirmed paths + JSON schema sample + a ToolSpec entry. Bring evidence (real session transcript fixture).