feat(packages): add g3

Pinned commit: upstream has no tags. Ships g3 and g3-studio.

Closes nix-overlay-ikz

README.md

@@ -20,6 +20,7 @@ A custom Nix overlay and flake providing additional packages not found in upstre
 | `freebuff` | The world's strongest free coding agent | AI Coding Agents |
 | `freetoken` | Local MoE-offload LLM inference runtime with OpenAI- and Anthropic-compatible APIs | AI Inference |
 | `graphify` | Turn any folder of code, docs, papers, images, or videos into a queryable knowledge graph | AI Coding Agents |
+| `g3` | AI coding agent that writes code and executes commands, with multi-provider LLM support, context compaction, and desktop automation | AI Coding Agents |
 | `haivemind` | Multi-model AI consensus, aggregation, and fusion runner for popular AI CLIs | AI Coding Agents |
 | `hipengine` | ROCm-native local LLM inference engine with torch-free runtime for AMD RDNA GPUs | AI Inference |
 | `marmel` | Autonomous agentic coding assistant with Manager + specialist subagent orchestration over any OpenAI-compatible LLM backend | AI Coding Agents |
@@ -155,6 +156,7 @@ nix-overlay/
 │   ├── freebuff/               # Free coding agent (Codebuff)
 │   ├── freetoken/             # Local MoE inference runtime (NVIDIA CUDA)
 │   ├── graphify/               # Knowledge graph generator for code folders
+│   ├── g3/                     # AI coding agent (g3 + g3-studio)
 │   ├── haivemind/              # Multi-model AI consensus runner
 │   ├── hipengine/              # ROCm-native LLM inference engine for AMD GPUs
 │   ├── kubernetes-mcp-server/  # MCP server for Kubernetes and OpenShift