When continuing an old chat session, CodePilot passes the stored
sdk_session_id to the SDK with resume=true. If the local SDK session
file is stale, corrupt, or incompatible (e.g. after a CLI version
update), the SDK process exits with code 1 and the user sees a
misleading "Invalid or missing API Key" error.
This fix wraps the initial query() call with a try-catch that detects
resume failures by peeking at the first async message. On failure, it
automatically retries without the resume option, starting a fresh SDK
session while preserving the chat history in CodePilot.
- src/lib/claude-client.ts: added resume-failure detection and
automatic fallback logic around the query() call
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