docs: add usage and developer documentation

Add user and developer documentation plus Pagenary docsite publishing support.

Includes Getting Started, Developer Guide, API and MCP references, Pagenary tenant metadata, npm scripts for sync/build/check/serve, and validation coverage for the generated docsite.

Closes #102

docsite/t3mp3st-docs/content/operators.md

@@ -0,0 +1,22 @@
+---
+title: "Operators"
+summary: "Install, configure, scope, and review T3MP3ST safely."
+description: "Install, configure, scope, and review T3MP3ST safely."
+audience: ["operator", "developer", "maintainer"]
+category: "navigation"
+status: "current"
+source: "T3MP3ST repository"
+sourcePath: "generated:operators"
+updated: "2026-07-20"
+---
+# Operators
+
+Install, configure, scope, and review T3MP3ST safely.
+
+## Pages
+
+- [Getting Started](#getting-started) - Install, configure, launch, and run the first safe T3MP3ST workflow.
+- [Scope and Authorization](#scope-and-authorization) - Rules of engagement, authorization receipts, evidence, and retest boundaries.
+- [Target Headers](#target-headers) - How to inject target-scoped authentication headers safely.
+- [Arsenal Activation Plan](#arsenal-activation-plan) - Install optional external tools and understand adapter readiness.
+- [Team Preview](#team-preview) - Ten-minute preview path for evaluating the War Room and local-safe flows.