init: vibn-agent-runner — Gemini autonomous agent backend

Made-with: Cursor

.env.example

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+# Google AI — required for all agents
+GOOGLE_API_KEY=your-gemini-api-key
+
+# Gitea — required for git push, issue management
+GITEA_API_URL=https://git.vibnai.com
+GITEA_API_TOKEN=your-gitea-token
+GITEA_USERNAME=your-gitea-username
+
+# Coolify — required for deployment tools
+COOLIFY_API_URL=https://coolify.vibnai.com
+COOLIFY_API_TOKEN=your-coolify-token
+
+# Server config
+PORT=3333
+
+# Base path where agent workspaces are cloned
+# Each repo gets a subfolder: /workspaces/owner_reponame
+WORKSPACE_BASE=/workspaces
+
+# Optional: internal URL of this service (used by spawn_agent to self-call)
+AGENT_RUNNER_URL=http://localhost:3333
+
+# Optional: shared secret for validating Gitea webhook POSTs
+WEBHOOK_SECRET=