docs: add root homelab runbook and debug documentation

RUNBOOK.md

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+# KiteStacks Homelab Runbook
+
+## Purpose
+
+This repository documents the KiteStacks homelab.
+
+## Documentation Standard
+
+Each major repo or project should have RUNBOOK.md, CHANGELOG.md, and DEBUG-DOCUMENTATION.md.
+
+## Main Host
+
+Primary host: Assassin
+
+Main repo: /opt/kitestacks-autosync/kitestacks-homelab
+
+## Public URLs
+
+- https://www.kitestacks.com
+- https://gitforge.kitestacks.com
+- https://auth.kitestacks.com
+
+## Discord Integration
+
+Project docs live in projects/Discord Integration/.
+
+Recent activity channel: #recent-activity
+
+Webhook env file: /etc/kitestacks/discord-webhook.env
+
+Activity script: /usr/local/bin/kitestacks-discord-activity.sh
+
+Do not commit webhook URLs, tokens, secrets, database files, sessions, or live container data.
+
+## Known Issue
+
+The root CHANGELOG.md was generated by autosync and includes live app/database file changes.