Simplify AgentStage configuration

.gitea/deployment-secrets.example.env

@@ -1,10 +0,0 @@
-# Gitea repository Secrets template.
-# Create the two repository Secrets with these exact names under
-# Repository Settings -> Actions -> Secrets, then enter values only in Gitea.
-# This committed template intentionally contains no secret values.
-
-# Git credential/token used by the publisher for the ttshop repository.
-GIT_CREDENTIAL_SECRET=
-
-# HTTPS endpoint receiving exactly one notification for a failed run.
-SYNC_FAILURE_WEBHOOK_URL=

.gitea/deployment-vars.example.env

@@ -1,9 +0,0 @@
-# Gitea repository Variables template (non-sensitive values only).
-# Create these under Repository Settings -> Actions -> Variables.
-# Do not place credentials or a webhook URL in this file.
-
-# Public HTTPS origin of the Gitea instance, without repository path/query/fragment.
-GITEA_BASE_URL=https://gitea.example.invalid
-
-# One URL path segment identifying the repository owner or organization.
-GITEA_OWNER=replace-with-gitea-owner