Revert temporary agents read grant on Authentik provider token (#138)

## Why
The one-off terragrunt import in terraform-authentik that required this grant is complete (jellyfin provider, groups, application, and policy bindings are all reconciled into state; apply pipeline is green). Per the recovery plan the temporary read grant is removed again.

## Changes
- Reverts de9d6e5: removes policies/kv/service/terraform/authentik/read.yaml (agents AppRole read on kv/data/service/terraform/authentik)

Reviewed-on: #138
Co-authored-by: unkin-agent <unkin-agent@unkin.net>
Co-committed-by: unkin-agent <unkin-agent@unkin.net>

policies/kv/service/terraform/authentik/read.yaml

@@ -1,14 +0,0 @@
-# Lets the agents AppRole read the Authentik provider API token so a coding
-# agent can run a one-off `terragrunt import` in terraform-authentik to
-# reconcile resources orphaned by the failed jellyfin apply. Read-only on the
-# single token path; revert once the import is done. Mirrors the
-# gitea/creds/unkin-agent binding pattern.
----
-rules:
-  - path: "kv/data/service/terraform/authentik"
-    capabilities:
-      - read
-
-auth:
-  approle:
-    - agents