## Problem
Strip the DietPi install down to the minimum footprint for the pedal. Profile baseline resource usage, then remove unnecessary packages and services. Target < 60MB idle RAM and < 500MB disk.

## File scope
- `scripts/dietpi-postinstall.sh` — DietPi first-boot setup with minimal packages
- `scripts/minimize.sh` — identify and remove unused packages, disable unnecessary systemd services
- `scripts/build-minimal-image.sh` — take the stripped install and produce a flashable image
- `docs/baseline-footprint.md` — before/after resource comparisons

## Approach
1. Install DietPi minimal (no desktop, no software options)
2. Install only what's needed: JACK, Python, PyTorch, cmake, GPIO libs, I2C tools
3. Run `systemd-analyze blame` to identify slow services
4. Disable: avahi, triggerhappy, ModemManager, systemd-resolved if not needed
5. **KEEP: bluetooth (for MIDI controllers, wireless tuner apps), wifi (for web UI, preset downloads)**
6. Use `dpkg-query -Wf '${Installed-Size}\t${Package}\n' | sort -rn` to find biggest packages, remove non-essentials
7. Strip kernel modules not needed (remove sound modules for hardware we don't have, etc.)
8. Document the removal process so it's repeatable
9. Build a minimal SD card image from the stripped install

## Dependencies
Blocks on: Audio system setup (t_9deaa72c) — need JACK working first for baselines

## Acceptance Criteria
- [ ] Baseline footprint documented (RAM + disk before/after)
- [ ] All unnecessary systemd services disabled
- [ ] Blutetooth and wifi preserved and functional
- [ ] Unused kernel modules removed
- [ ] No functionality lost — JACK, NAM, MIDI, GPIO, I2S all still work
- [ ] < 60MB idle RAM, < 500MB disk
- [ ] Repeatable minimize script committed to repo
- [ ] Boot time < 15 seconds to pedal ready