init: spark DGX finetuning repo

AGENTS.md

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+# Spark -- DGX Finetuning
+
+Docs, scripts, and recipes for finetuning on the DGX Spark.
+
+## Target Host: sin (sinanju)
+
+| Field | Value |
+|---|---|
+| Hostname | `sin` / `sinanju` |
+| User | `madcat` |
+| LAN | `192.168.88.108` |
+| WireGuard (mesh) | `10.44.0.2` |
+| SSH | `ssh sin` or `ssh madcat` (LAN), `mesh-sin` (WG) |
+
+### Hardware
+
+| Component | Spec |
+|---|---|
+| Model | NVIDIA DGX Spark Founders Edition |
+| Baseboard | P4242, rev A.7 |
+| GPU | GB10 (sm_121) |
+| Memory | ~128 GiB unified (CPU+GPU shared) |
+| NIC | Realtek RTL8127 10GbE |
+| WiFi | MediaTek 7925 |
+| Architecture | aarch64 |
+
+### Software
+
+| Component | Version |
+|---|---|
+| DGX OS | 7.5.0 |
+| Kernel | 6.17.0-1018-nvidia |
+| Driver | 580.159.03 |
+| BIOS | 5.36_0ACUM018 |
+
+### Services
+
+- **Ollama** -- localhost:11434 (local model serving)
+- **opencode-serve** -- 0.0.0.0:4096 (systemd user service)
+- **DGX Dashboard** -- localhost:8787
+
+### Key Paths
+
+```
+/etc/dgx-release                          # version manifest
+/opt/nvidia/nvfwupd/bin/nvfwupd            # firmware update tool
+/opt/nvidia/bin/spark-ota-check            # OTA check CLI
+/home/madcat/.config/opencode/opencode.jsonc  # opencode config
+```
+
+## Repo Structure
+
+```
+spark/
+  AGENTS.md        # this file
+```
+
+## Notes
+
+- `nvidia-smi` showing N/A is **normal** for Spark -- it's not a discrete GPU
+- GB10 uses unified memory; no separate VRAM
+- BIOS `_0ACUM023` exists but is not in OTA pipeline (request via NVIDIA support)
+- Known BIOS issue: early firmware can hang during long-context (~200k tok) vLLM prefill