feat: Update devcontainer setup with Dockerfile and improved script for pre-commit hooks

.devcontainer/Dockerfile

@@ -0,0 +1,7 @@
+# .devcontainer/Dockerfile
+FROM mcr.microsoft.com/devcontainers/javascript-node:1-20-bullseye
+
+# CACHED INSTALLATION:
+# Install global NPM packages here. This creates a cached Docker layer.
+# We use 'su node' to ensure permissions are correct for the non-root user.
+RUN su node -c "npm install -g @google/gemini-cli"

.devcontainer/devcontainer.json

@@ -0,0 +1,40 @@
+{
+  "name": "Gemini Agent Quality Ops",
+  "build": {
+    "dockerfile": "Dockerfile"
+  },
+  "features": {
+    "ghcr.io/devcontainers/features/python:1": {
+      "version": "3.11",
+      "installTools": true,
+      "optimize": true
+    },
+    "ghcr.io/devcontainers/features/git:1": {},
+    "ghcr.io/devcontainers/features/git-lfs:1": {},
+    "ghcr.io/devcontainers-extra/features/pre-commit:2": {}
+  },
+  "customizations": {
+    "vscode": {
+      "extensions": [
+        "ms-python.python",
+        "esbenp.prettier-vscode",
+        "vitest.explorer",
+        "google.gemini-cli-vscode-ide-companion",
+        "google.geminicodeassist"
+      ],
+      "settings": {
+        "editor.formatOnSave": true,
+        "editor.defaultFormatter": "esbenp.prettier-vscode"
+      }
+    }
+  },
+  "postStartCommand": "bash .devcontainer/setup.sh",
+  "remoteUser": "vscode",
+  "updateRemoteUserUID": true,
+  "mounts": [
+    "source=pipx-venvs,target=/home/node/.local/share/pipx,type=volume",
+    "source=pipx-bin,target=/home/node/.local/bin,type=volume",
+    "source=pre-commit-cache,target=/home/node/.cache/pre-commit,type=volume",
+    "source=${localEnv:USERPROFILE}/.gemini,target=/home/node/.gemini,type=bind"
+  ]
+}

.devcontainer/setup.sh

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+#!/bin/bash
+
+# 1. Fix Git Permissions (Critical in Docker)
+git config --global --add safe.directory $(pwd)
+
+# 2. Re-connect Git Hooks
+if command -v pre-commit &> /dev/null; then
+    pre-commit install
+else
+    echo "⚠️ Warning: pre-commit not found. Skipping hook installation."
+fi