refactor: reorganize skills into sub-categories

The skills directory was getting disorganized — mlops alone had 40
skills in a flat list, and 12 categories were singletons with just
one skill each.

Code change:
- prompt_builder.py: Support sub-categories in skill scanner.
  skills/mlops/training/axolotl/SKILL.md now shows as category
  'mlops/training' instead of just 'mlops'. Backwards-compatible
  with existing flat structure.

Split mlops (40 skills) into 7 sub-categories:
- mlops/training (12): accelerate, axolotl, flash-attention,
  grpo-rl-training, peft, pytorch-fsdp, pytorch-lightning,
  simpo, slime, torchtitan, trl-fine-tuning, unsloth
- mlops/inference (8): gguf, guidance, instructor, llama-cpp,
  obliteratus, outlines, tensorrt-llm, vllm
- mlops/models (6): audiocraft, clip, llava, segment-anything,
  stable-diffusion, whisper
- mlops/vector-databases (4): chroma, faiss, pinecone, qdrant
- mlops/evaluation (5): huggingface-tokenizers,
  lm-evaluation-harness, nemo-curator, saelens, weights-and-biases
- mlops/cloud (2): lambda-labs, modal
- mlops/research (1): dspy

Merged singleton categories:
- gifs → media (gif-search joins youtube-content)
- music-creation → media (heartmula, songsee)
- diagramming → creative (excalidraw joins ascii-art)
- ocr-and-documents → productivity
- domain → research (domain-intel)
- feeds → research (blogwatcher)
- market-data → research (polymarket)

Fixed misplaced skills:
- mlops/code-review → software-development (not ML-specific)
- mlops/ml-paper-writing → research (academic writing)

Added DESCRIPTION.md files for all new/updated categories.

skills/mlops/inference/tensorrt-llm/SKILL.md

@@ -0,0 +1,190 @@
+---
+name: tensorrt-llm
+description: Optimizes LLM inference with NVIDIA TensorRT for maximum throughput and lowest latency. Use for production deployment on NVIDIA GPUs (A100/H100), when you need 10-100x faster inference than PyTorch, or for serving models with quantization (FP8/INT4), in-flight batching, and multi-GPU scaling.
+version: 1.0.0
+author: Orchestra Research
+license: MIT
+dependencies: [tensorrt-llm, torch]
+metadata:
+  hermes:
+    tags: [Inference Serving, TensorRT-LLM, NVIDIA, Inference Optimization, High Throughput, Low Latency, Production, FP8, INT4, In-Flight Batching, Multi-GPU]
+
+---
+
+# TensorRT-LLM
+
+NVIDIA's open-source library for optimizing LLM inference with state-of-the-art performance on NVIDIA GPUs.
+
+## When to use TensorRT-LLM
+
+**Use TensorRT-LLM when:**
+- Deploying on NVIDIA GPUs (A100, H100, GB200)
+- Need maximum throughput (24,000+ tokens/sec on Llama 3)
+- Require low latency for real-time applications
+- Working with quantized models (FP8, INT4, FP4)
+- Scaling across multiple GPUs or nodes
+
+**Use vLLM instead when:**
+- Need simpler setup and Python-first API
+- Want PagedAttention without TensorRT compilation
+- Working with AMD GPUs or non-NVIDIA hardware
+
+**Use llama.cpp instead when:**
+- Deploying on CPU or Apple Silicon
+- Need edge deployment without NVIDIA GPUs
+- Want simpler GGUF quantization format
+
+## Quick start
+
+### Installation
+
+```bash
+# Docker (recommended)
+docker pull nvidia/tensorrt_llm:latest
+
+# pip install
+pip install tensorrt_llm==1.2.0rc3
+
+# Requires CUDA 13.0.0, TensorRT 10.13.2, Python 3.10-3.12
+```
+
+### Basic inference
+
+```python
+from tensorrt_llm import LLM, SamplingParams
+
+# Initialize model
+llm = LLM(model="meta-llama/Meta-Llama-3-8B")
+
+# Configure sampling
+sampling_params = SamplingParams(
+    max_tokens=100,
+    temperature=0.7,
+    top_p=0.9
+)
+
+# Generate
+prompts = ["Explain quantum computing"]
+outputs = llm.generate(prompts, sampling_params)
+
+for output in outputs:
+    print(output.text)
+```
+
+### Serving with trtllm-serve
+
+```bash
+# Start server (automatic model download and compilation)
+trtllm-serve meta-llama/Meta-Llama-3-8B \
+    --tp_size 4 \              # Tensor parallelism (4 GPUs)
+    --max_batch_size 256 \
+    --max_num_tokens 4096
+
+# Client request
+curl -X POST http://localhost:8000/v1/chat/completions \
+  -H "Content-Type: application/json" \
+  -d '{
+    "model": "meta-llama/Meta-Llama-3-8B",
+    "messages": [{"role": "user", "content": "Hello!"}],
+    "temperature": 0.7,
+    "max_tokens": 100
+  }'
+```
+
+## Key features
+
+### Performance optimizations
+- **In-flight batching**: Dynamic batching during generation
+- **Paged KV cache**: Efficient memory management
+- **Flash Attention**: Optimized attention kernels
+- **Quantization**: FP8, INT4, FP4 for 2-4× faster inference
+- **CUDA graphs**: Reduced kernel launch overhead
+
+### Parallelism
+- **Tensor parallelism (TP)**: Split model across GPUs
+- **Pipeline parallelism (PP)**: Layer-wise distribution
+- **Expert parallelism**: For Mixture-of-Experts models
+- **Multi-node**: Scale beyond single machine
+
+### Advanced features
+- **Speculative decoding**: Faster generation with draft models
+- **LoRA serving**: Efficient multi-adapter deployment
+- **Disaggregated serving**: Separate prefill and generation
+
+## Common patterns
+
+### Quantized model (FP8)
+
+```python
+from tensorrt_llm import LLM
+
+# Load FP8 quantized model (2× faster, 50% memory)
+llm = LLM(
+    model="meta-llama/Meta-Llama-3-70B",
+    dtype="fp8",
+    max_num_tokens=8192
+)
+
+# Inference same as before
+outputs = llm.generate(["Summarize this article..."])
+```
+
+### Multi-GPU deployment
+
+```python
+# Tensor parallelism across 8 GPUs
+llm = LLM(
+    model="meta-llama/Meta-Llama-3-405B",
+    tensor_parallel_size=8,
+    dtype="fp8"
+)
+```
+
+### Batch inference
+
+```python
+# Process 100 prompts efficiently
+prompts = [f"Question {i}: ..." for i in range(100)]
+
+outputs = llm.generate(
+    prompts,
+    sampling_params=SamplingParams(max_tokens=200)
+)
+
+# Automatic in-flight batching for maximum throughput
+```
+
+## Performance benchmarks
+
+**Meta Llama 3-8B** (H100 GPU):
+- Throughput: 24,000 tokens/sec
+- Latency: ~10ms per token
+- vs PyTorch: **100× faster**
+
+**Llama 3-70B** (8× A100 80GB):
+- FP8 quantization: 2× faster than FP16
+- Memory: 50% reduction with FP8
+
+## Supported models
+
+- **LLaMA family**: Llama 2, Llama 3, CodeLlama
+- **GPT family**: GPT-2, GPT-J, GPT-NeoX
+- **Qwen**: Qwen, Qwen2, QwQ
+- **DeepSeek**: DeepSeek-V2, DeepSeek-V3
+- **Mixtral**: Mixtral-8x7B, Mixtral-8x22B
+- **Vision**: LLaVA, Phi-3-vision
+- **100+ models** on HuggingFace
+
+## References
+
+- **[Optimization Guide](references/optimization.md)** - Quantization, batching, KV cache tuning
+- **[Multi-GPU Setup](references/multi-gpu.md)** - Tensor/pipeline parallelism, multi-node
+- **[Serving Guide](references/serving.md)** - Production deployment, monitoring, autoscaling
+
+## Resources
+
+- **Docs**: https://nvidia.github.io/TensorRT-LLM/
+- **GitHub**: https://github.com/NVIDIA/TensorRT-LLM
+- **Models**: https://huggingface.co/models?library=tensorrt_llm
+
+