Bun compiled binaries have an empty process.env when running inside sandbox environments (e.g. nono on Linux/macOS). This broke API key detection and model discovery because all process.env.* lookups returned undefined. - Add restoreSandboxEnv() helper that reads /proc/self/environ when Bun is detected and process.env is empty, populating process.env before any other code runs (coding-agent/src/bun/cli.ts entry point) - Add getProcEnv() fallback in env-api-keys.ts for direct @mariozechner/pi-ai consumers that may not go through the coding-agent entry point - Add unit tests for restoreSandboxEnv