feat(docs): Add comprehensive documentation for Vexer, Vulnerability Explorer, and Zastava modules

- Introduced AGENTS.md, README.md, TASKS.md, and implementation_plan.md for Vexer, detailing mission, responsibilities, key components, and operational notes.
- Established similar documentation structure for Vulnerability Explorer and Zastava modules, including their respective workflows, integrations, and observability notes.
- Created risk scoring profiles documentation outlining the core workflow, factor model, governance, and deliverables.
- Ensured all modules adhere to the Aggregation-Only Contract and maintain determinism and provenance in outputs.

plugins/cli/StellaOps.Cli.Plugins.NonCore/manifest.json

@@ -1,21 +0,0 @@
-{
-  "schemaVersion": "1.0",
-  "id": "stellaops.cli.plugins.noncore",
-  "displayName": "StellaOps CLI Non-core Verbs",
-  "version": "0.1.0",
-  "requiresRestart": true,
-  "entryPoint": {
-    "type": "dotnet",
-    "assembly": "StellaOps.Cli.Plugins.NonCore.dll",
-    "typeName": "StellaOps.Cli.Plugins.NonCore.NonCoreCliCommandModule"
-  },
-  "capabilities": [
-    "cli",
-    "excititor",
-    "runtime-policy",
-    "offline-kit"
-  ],
-  "metadata": {
-    "org.stellaops.restart.required": "true"
-  }
-}