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Phase 3 foundations (task 1): src/lib/xrpc-error.ts matches both the old @atproto/api XRPCError and lex-client XrpcError/XrpcResponseError during the migration; errors.ts token-invalid matching goes through it. toLex<T>() added to #/types/bsky as a marked interim cast for mixed-world boundaries. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>