Existing submissions are not retroactively checked. AST re-check
for existing AC submissions deferred to Phase 2.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
- AST check moves to AFTER judging (only on AC submissions)
- AST_CHECK_FAILED treated as AC for accepted_number and user profile
- statistic_info keeps separate count for drill-down visibility
- Status code changed to 10 (9 conflicts with frontend submitting)
- Added frontend impact analysis for SubmissionResult, WebSocket, problem list
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Tree-sitter based code structure validation for submissions,
with per-problem per-language rule configuration.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
