Add AGENTS.md with Cursor Cloud development environment instructions

AGENTS.md

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+# AGENTS.md
+
+## Cursor Cloud specific instructions
+
+This is a **laboratory instrumentation codebase** (Breuer Lab, Brown University) for wind tunnel aerodynamics research. It is primarily MATLAB-based with two embedded firmware components that can be built in a cloud environment.
+
+### Buildable components (no hardware required)
+
+| Component | Path | Tool | Build command |
+|-----------|------|------|---------------|
+| ESP32 firmware (Calimero) | `Calimero/ESP32/` | PlatformIO | `pio run` (from that directory) |
+| TriggerBox v2.6 | `TriggerBox/TriggerBox_v2.6/` | Arduino CLI | `arduino-cli compile --fqbn arduino:avr:uno TriggerBox/TriggerBox_v2.6/TriggerBox_v2.6.ino` |
+
+### Lint/static analysis
+
+- **ESP32 (PlatformIO):** `cd Calimero/ESP32 && pio check --skip-packages`
+- **Arduino sketches:** compilation itself serves as the lint step (`arduino-cli compile`)
+
+### Known pre-existing issues
+
+- `Calimero/ESP32/src/main.cpp` line 76 has a missing semicolon — `pio run` will fail until fixed.
+- `TriggerBox/TriggerBox2.0/TriggerBox2.0.ino` has pre-existing syntax errors.
+- `TriggerBox/TriggerBox_v2.6/TriggerBox_v2.6.ino` compiles cleanly.
+
+### What cannot run in a cloud environment
+
+The MATLAB scripts (majority of the repo) require:
+- MATLAB with Data Acquisition Toolbox
+- Physical hardware (NI-DAQ, ATI load cells, Galil DMC controllers, Kollmorgen servo drives)
+- Vendor drivers (NI-DAQmx, Galil ActiveX toolkit)
+
+These are inherently hardware-dependent and cannot be tested without lab equipment.