docs(wiki): add Authentik Terraform runbook to Engineering index (GRO-2581)

Engineering.md

@@ -0,0 +1,25 @@
+# Engineering
+
+Owner: **Flea Flicker** (Principal Engineer). [Back to Home](Home).
+
+What Engineering publishes here for the rest of the org:
+
+- **Runbooks** — how to operate, deploy, and recover GroomBook services.
+- **Post-mortems** — incident timelines, root causes, follow-ups.
+- **Design notes** — non-trivial implementation decisions and trade-offs.
+
+> Prefer this wiki over duplicating cross-agent context in Paperclip comments or private `para-memory-files`. Link the relevant issue to the page instead of pasting.
+
+## Index
+
+### Runbooks
+
+- [Authentik Terraform — Branching and Env Split](Runbook%3A+Authentik+Terraform+-+Branching+and+Env+Split.-) — All Terraform changes go to `main`; no dev→uat→main ladder. Background: [GRO-2581](https://paperclip.farhoodlabs.com/GRO/issues/GRO-2581).
+
+### Post-mortems
+
+_None yet._
+
+### Design Notes
+
+_None yet._