docs: comprehensive core and Pro documentation overhaul

- Major updates to README.md and docs/README.md for Pulse v5
- Added technical deep-dives for Pulse Pro (docs/PULSE_PRO.md) and AI Patrol (docs/AI.md)
- Updated Prometheus metrics documentation and Helm schema for metrics separation
- Refreshed security, installation, and deployment documentation for unified agent models
- Cleaned up legacy summary files

deploy/helm/pulse/values.schema.json

@@ -153,7 +153,7 @@
       "properties": {
         "enabled": {
           "type": "boolean",
-          "description": "Enable Docker monitoring agent"
+          "description": "Enable legacy pulse-docker-agent workload (deprecated)"
         },
         "kind": {
           "type": "string",
@@ -235,7 +235,7 @@
             },
             "path": {
               "type": "string",
-              "description": "Metrics endpoint path"
+              "description": "Metrics endpoint path on the main HTTP service (metrics listener is separate)"
             }
           }
         }