docs: add quick start guide for project setup and build

Add QUICK_START.md with current status, quick commands for checking build status, restarting build, and cleanup procedures for rapid project resumption and execution.

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QUICK_START.md

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+# KNEL-Football Project - Quick Start
+
+## Current Status (2026-01-24 19:00 CST)
+
+### ISO Build Running in Background
+- **Status**: Active build (3rd attempt, minimal config)
+- **Started**: 18:04 CST
+- **Expected Completion**: 19:00-19:15 CST
+- **Log**: `/tmp/knel-iso-build.log`
+
+### First Actions When Returning
+
+1. **Check if ISO is ready**:
+   ```bash
+   cd /home/tsys/Projects/KNEL/football
+   ls -lh output/
+   ```
+   Expected: `knel-football-secure-v1.0.0.iso` (~1-2GB)
+
+2. **If ISO is ready**, verify it:
+   ```bash
+   cd output/
+   sha256sum -c knel-football-secure-v1.0.0.iso.sha256
+   ```
+
+3. **If ISO is NOT ready**, check build progress:
+   ```bash
+   tail -50 /tmp/knel-iso-build.log | grep "P:"
+   ```
+
+## Quick Commands
+
+### Check Build Status
+```bash
+cd /home/tsys/Projects/KNEL/football
+ls -lh output/                    # Check for ISO
+tail -f /tmp/knel-iso-build.log   # Monitor build
+```
+
+### Restart Build (if failed)
+```bash
+# See full command in RESUME.md
+# Current working config documented there
+```
+
+### Clean Up
+```bash
+./run.sh clean    # Remove artifacts
+./run.sh lint     # Check scripts
+./run.sh test     # Run tests
+```
+
+## Key Files
+
+| File | Purpose |
+|------|---------|
+| `RESUME.md` | Complete resumption guide (START HERE) |
+| `JOURNAL.md` | Development journal (append-only) |
+| `AGENTS.md` | Docker-only workflow requirements |
+| `run.sh` | Main entry point (build/test/lint/iso/clean) |
+| `Dockerfile` | Build environment |
+| `config/` | Live-build configuration |
+| `output/` | Final ISO artifacts (when complete) |
+
+## Build Configuration (Working Version)
+
+### Required Flags
+- `--privileged` - Mount operations
+- `--user root` - Live-build requirement
+- Build in `/tmp` - Not mounted volume
+- USER_UID/USER_GID - Ownership preservation
+
+### Removed Flags (Causing Issues)
+- `--linux-packages` - Duplicate package names
+- `--memtest` - Missing file
+- `--win32-loader` - Package not available
+
+## Expected Output
+
+### When Build Completes
+```
+output/
+├── knel-football-secure-v1.0.0.iso      (~1-2GB)
+├── knel-football-secure-v1.0.0.iso.sha256 (checksum)
+└── knel-football-secure-v1.0.0.iso.md5    (checksum)
+```
+
+### All Files Owned By You
+- User: tsys (UID 1000)
+- Group: tsys (GID 1000)
+- NOT root
+
+## Next Steps After Build Completes
+
+1. Verify ISO and checksums
+2. Test ISO boot with libvirt/virsh
+3. Validate security features:
+   - WiFi/Bluetooth disabled
+   - SSH configuration
+   - Firewall rules
+   - USB automount
+   - WireGuard QR code import
+
+## Session Summary
+
+- **Work Time**: 8 hours (11:00-19:00 CST)
+- **ISO Build Attempts**: 7
+- **Final Strategy**: Minimal configuration (working)
+- **Status**: Build running, expected completion in ~15 minutes
+- **Documentation**: Complete (RESUME.md, JOURNAL.md)
+
+**Safe to close session.** All work documented. Check `output/` when returning.
+
+---