Add controlled coding agent automation

.env.example

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+FAILURE_DB_HOST=host.docker.internal
+FAILURE_DB_PORT=33060
+FAILURE_DB_NAME=laravel_ai_chat
+FAILURE_DB_USER=laravel
+FAILURE_DB_PASSWORD=
+
+SOURCE_REPOSITORY=https://gitea.tisinfra.de/christian.meyer/lai.git
+SOURCE_BRANCH=main
+GITEA_URL=https://gitea.tisinfra.de
+GITEA_OWNER=christian.meyer
+GITEA_REPOSITORY=lai
+GITEA_USERNAME=automation-bot
+GITEA_TOKEN=
+
+# dry-run, pr, direct-main
+AUTOMATION_MODE=dry-run
+ALLOW_DIRECT_MAIN=false
+
+AGENT_COMMAND=aider
+AGENT_MODEL=mistral/mistral-medium-latest
+MISTRAL_API_KEY=
+
+POLL_SECONDS=60
+STALE_CLAIM_MINUTES=90
+MAX_CHANGED_FILES=12
+MAX_CHANGED_LINES=800
+TEST_COMMANDS=composer install --no-interaction --prefer-dist;;php artisan test