Improve CLI error output and local logging to enable offline issue diagnosis:
- Add ServerDiagnostics struct to extract and propagate trace_id, server_error_code,
technical_detail, and server_retryable from MCP server responses
- Extract diagnostics from JSON-RPC error.data, tool call result content, and HTTP
response headers (X-Trace-Id, X-Request-Id, x-dingtalk-trace-id)
- Redesign PrintHuman with three verbosity levels (Normal/Verbose/Debug):
Normal shows trace ID + server code; Verbose adds technical detail;
Debug adds internal diagnostics (RPC code, operation, reason)
- Add PrintHumanAt for explicit verbosity control, PrintHuman defaults to Normal
- Enhance local logging with request body (sanitized), response body (on error),
retry attempts, and error classification events
- Add TruncateBody, SanitizeArguments, RedactHeaders logging utilities with
sensitive key detection via substring matching
- Fix respRetryAfter called before nil guard in doWithRetry retry loop
- Use GetBool instead of string comparison for flag resolution
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
- Replace nil context with context.TODO() in logger calls
- Fix import ordering and struct field alignment
- Restore .env.example required by open-source audit tests
fantiu