PR Template - Sprint 23 Task 04

Task

Enforce signed telemetry requirement (no unsigned fallback).

Summary

• Federation dispatch now fails closed if signature secret is not configured.

Scope

• src/pkg/integration/vectorvue/client.py
• tests/unit/integration/test_vectorvue_client.py

Validation

• PYTHONPATH=src .venv/bin/pytest -q tests/unit/integration/test_vectorvue_client.py -k signed