feat: Add Phase 2 - Geographic Hierarchy and Health Scoring

Implements mesh intelligence with geo clustering, four-pillar health scoring,
and auto-naming regions from GPS data.

New: geo.py, mesh_health.py
Modified: config.py, main.py, router.py, configurator.py, config.example.yaml

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

meshai/router.py

@@ -68,6 +68,7 @@ class MessageRouter:
         meshmonitor_sync=None,
         knowledge=None,
         source_manager=None,
+        health_engine=None,
     ):
         self.config = config
         self.connector = connector
@@ -77,7 +78,8 @@ class MessageRouter:
         self.context = context
         self.meshmonitor_sync = meshmonitor_sync
         self.knowledge = knowledge
-        self.source_manager = source_manager  # For future use in Phase 3
+        self.source_manager = source_manager
+        self.health_engine = health_engine
         self.continuations = ContinuationState(max_continuations=3)