AI copilot context state
- Implement Personal Access Token (PAT) management in UserService with SHA-256
hash storage and O(1) lookup.
- Add gRPC endpoints (CreateApiToken, ListApiTokens, RevokeApiToken) and CLI
commands.
- Allow authentication using CONNPY_TOKEN environment variable in
ServiceProvider.
- Persist AI Copilot context mode and accumulation ranges across prompt
sessions in terminal_ui.
- Propagate node_info_json metadata over Copilot gRPC tunnel stream.
- Add unit tests for PAT lifecycle and Copilot context state persistence (430
passing tests).
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