fix(ci): Add missing ReportingHandlers + fix Python 3.9 compat

- Create reporting_handlers.go with ReportingHandlers struct and 4
  endpoint methods (GetExecutiveReport, GetComplianceScore,
  GetUpcomingDeadlines, GetRiskOverview) to fix build failure
- Fix gap_analysis/analyzer.py: use Optional[list[str]] instead of
  list[str] | None for Python 3.9 compatibility

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

document-crawler/gap_analysis/analyzer.py

@@ -1,12 +1,16 @@
 """Gap detection logic — compares found documents against compliance matrix."""
 
+from __future__ import annotations
+
 import uuid
+from typing import Optional
+
 from .compliance_matrix import COMPLIANCE_MATRIX, RequiredDocument
 
 
 def generate_gap_analysis(
     classification_counts: dict[str, int],
-    company_profiles: list[str] | None = None,
+    company_profiles: Optional[list[str]] = None,
 ) -> dict:
     """Analyze gaps between found documents and required compliance matrix.