feat: replace Aider with secure mini-SWE-agent worker

.env.example

@@ -1,27 +1,34 @@
-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_REPOSITORY=https://gitea.example.test/owner/lai.git
 SOURCE_BRANCH=main
-GITEA_URL=https://gitea.tisinfra.de
-GITEA_OWNER=christian.meyer
+GITEA_URL=https://gitea.example.test
+GITEA_OWNER=owner
 GITEA_REPOSITORY=lai
 GITEA_USERNAME=automation-bot
 GITEA_TOKEN=
 
-# dry-run, pr, direct-main
-AUTOMATION_MODE=dry-run
-ALLOW_DIRECT_MAIN=false
+GITEA_QUEUED_LABEL=ai:queued
+GITEA_RUNNING_LABEL=ai:running
+GITEA_READY_LABEL=ai:ready
+GITEA_FAILED_LABEL=ai:failed
+POLL_SECONDS=60
 
-AGENT_COMMAND=aider
 AGENT_MODEL=mistral/devstral-latest
 MISTRAL_API_KEY=
+# Optional OpenAI-compatible endpoint instead of Mistral:
+AGENT_MODEL_API_BASE=
+AGENT_COMMAND_TIMEOUT_SECONDS=180
+AGENT_TIMEOUT_SECONDS=1200
+AGENT_STEP_LIMIT=50
+AGENT_COST_LIMIT=5
 
-POLL_SECONDS=60
-STALE_CLAIM_MINUTES=90
+SETUP_COMMANDS=composer install --no-interaction --prefer-dist;;npm ci
+TEST_COMMANDS=npm run build;;php artisan test
+TEST_DB_HOST=laravel-ai-chat-mysql
+TEST_DB_PORT=3306
+TEST_DB_NAME=laravel_ai_chat_agent_test
+TEST_DB_USER=lai_test_runner
+TEST_DB_PASSWORD=agent_test_secret
+TEST_CUSTOMER_DB=customer_agent_test
+TEST_CONFIG_DB=cockpit_agent_test
 MAX_CHANGED_FILES=12
 MAX_CHANGED_LINES=800
-TEST_COMMANDS=composer install --no-interaction --prefer-dist;;php artisan test