feat: GPU detection for LLM server (NVIDIA/AMD/Intel/Vulkan + CPU fallback)

- Added start-llama-server.bat with cross-brand GPU auto-detection:
  * Detection 1: nvidia-smi for NVIDIA
  * Detection 2: WMIC for AMD, Intel Arc, Intel HD/Iris/UHD
  * Detection 3: vulkaninfo as final fallback probe
  * Falls back to CPU-only build when no GPU found
- Downloaded llama-server b9947 builds:
  * Vulkan build (91 MB) - supports all GPU brands
  * CPU build (45 MB) - fallback in cpu/ subdir
- Downloaded Qwen2.5-Coder-1.5B Q4_K_M model (1.1 GB)
- Fixed run-hermes.bat polling: replaces fixed 5s timeout with
  curl-based readiness polling (up to 30 attempts, 1s apart)
- All .bat files verified: ASCII text, CRLF line terminators
- Added .gitignore for build artifacts and large binaries

.gitignore

@@ -0,0 +1,32 @@
+# Build artifacts (large binaries, not tracked in git)
+build/output/hermes-rescue.iso
+build/output/casper-rw
+build/output/hermes-data.ext4
+build/output/fix-line-endings.ps1
+build/iso-staging/
+build/xubuntu-24.04*.iso
+build/SHA256SUMS
+build/hermes-build.fs
+
+# Model and native binaries (large, downloaded at build time)
+*.gguf
+*.dll
+*.exe
+
+# Python cache
+__pycache__/
+*.pyc
+*.pyo
+
+# IDE/editor
+.vscode/
+.idea/
+*.swp
+*.swo
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Secrets
+src/hermes/auth.json