docs(skills): add vllm 3090 update workflow

.agents/skills/update-vllm-3090-configs/SKILL.md

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+---
+name: update-vllm-3090-configs
+description: Update only the qwen3.6-27b vLLM 3090 llama-swap configs from club-3090 refs; compare diffs, present a plan, and require approval before editing.
+---
+
+# Update vLLM 3090 Configs
+
+## Scope
+
+Use only for Qwen3.6 27B vLLM 3090 configs in `modules/nixos/services/llama-swap/`.
+Do not use this skill for other models, other Qwen sizes, non-vLLM configs, or package bumps.
+
+Local files:
+- `modules/nixos/services/llama-swap/config.nix`
+- `modules/nixos/services/llama-swap/setup-qwen36-vllm.sh`
+
+Local config keys:
+- `vllm-qwen3.6-27b-tools-text`
+- `vllm-qwen3.6-27b-long-text`
+- `vllm-qwen3.6-27b-long-vision`
+
+## Upstream References
+
+Compare against `club-3090` master:
+- `models/qwen3.6-27b/vllm/compose/single/tools-text.yml`
+- `models/qwen3.6-27b/vllm/compose/single/long-text.yml`
+- `models/qwen3.6-27b/vllm/compose/single/long-vision.yml`
+- `scripts/setup.sh` for the current `GENESIS_PIN="${GENESIS_PIN:-...}"`
+
+Use raw URLs or a temp clone under `_scratch/club-3090`. Prefer a temp clone when checking broad changes:
+
+```bash
+mkdir -p _scratch
+git clone https://github.com/noonghunna/club-3090 _scratch/club-3090 2>/dev/null || git -C _scratch/club-3090 pull --ff-only
+```
+
+## Required Workflow
+
+1. Fetch/update upstream refs under `_scratch/club-3090` or fetch the raw files.
+2. Compare upstream compose files to the three local llama-swap entries. Translate docker-compose semantics into the existing `docker run`/llama-swap format.
+3. Compare upstream `scripts/setup.sh` Genesis pin to local `GENESIS_PIN` in `setup-qwen36-vllm.sh`.
+4. Check upstream compose volumes/entrypoint for sidecar patches. If patches are added, removed, renamed, or invoked differently, update both:
+   - runtime mounts and `python3 /patches/...` calls in `config.nix`
+   - download/install logic and summary in `setup-qwen36-vllm.sh`
+5. Ignore these diffs unless the user explicitly asks otherwise:
+   - `shm_size` / shm-related compose settings
+   - local timing patch `patch_timings_07351e088.py` and its mount/invocation
+   - model served-name differences caused by llama-swap `${MODEL_ID}`
+   - `HUGGING_FACE_HUB_TOKEN`; keep local CUDA device/env choices
+   - upstream relative paths vs local `/mnt/ssd/vLLM/...` paths
+   - docker-compose format vs local llama-swap/Nix format
+6. Before editing, present:
+   - upstream files/commit checked
+   - meaningful diffs found
+   - ignored diffs
+   - exact planned local changes
+   Then wait for explicit user approval.
+7. After approval, edit minimally and validate:
+   - `bash -n modules/nixos/services/llama-swap/setup-qwen36-vllm.sh`
+   - `nix-instantiate --parse modules/nixos/services/llama-swap/config.nix`
+8. Summarize changed files and any remaining upstream differences.