docs: add v1.6/v1.7 release notes and developer wiki (v1.7.6)

docs/wiki/Home.md

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+# JarvisChat Developer Wiki
+
+This wiki is the developer-facing architecture and process reference for JarvisChat.
+
+## Audience
+
+- Contributors maintaining backend, frontend, security posture, and deployment process
+- Operators validating local or homelab deployments
+
+## Start Here
+
+- Architecture and components: [Developer-Architecture.md](Developer-Architecture.md)
+- Active implementation backlog: [current-wip.md](current-wip.md)
+
+## Scope and Support Model
+
+JarvisChat is designed for local and trusted-LAN operation.
+
+The code may technically function against external or commercial endpoints, but this deployment mode is not a supported target in this project.
+
+## Wiki Maintenance Rule
+
+When architecture, security behavior, or test policy changes, update this wiki in the same change set as code and tests.