feat: add gitbun vscode extension scaffold

gitbun-vscode/.gitignore

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+out
+dist
+node_modules
+.vscode-test/
+*.vsix

gitbun-vscode/.vscode-test.mjs

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+import { defineConfig } from '@vscode/test-cli';
+
+export default defineConfig({
+	files: 'out/test/**/*.test.js',
+});

gitbun-vscode/.vscodeignore

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+.vscode/**
+.vscode-test/**
+src/**
+.gitignore
+.yarnrc
+vsc-extension-quickstart.md
+**/tsconfig.json
+**/eslint.config.mjs
+**/*.map
+**/*.ts
+**/.vscode-test.*

gitbun-vscode/CHANGELOG.md

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+# Change Log
+
+All notable changes to the "gitbun-vscode" extension will be documented in this file.
+
+Check [Keep a Changelog](http://keepachangelog.com/) for recommendations on how to structure this file.
+
+## [Unreleased]
+
+- Initial release

gitbun-vscode/README.md

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+# Gitbun for VSCode
+AI-powered commit message generation inside VSCode.
+## Requirements
+- Node.js installed
+- Gitbun CLI: `npm install -g gitbun`
+## Usage
+1. Stage your changes in Source Control
+2. Press `Ctrl+Shift+G G` (Mac: `Cmd+Shift+G G`) or run `Gitbun: Generate Commit Message` from the Command Palette
+3. The generated message appears in the Source Control input box
+4. Review, edit if needed, then click Commit
+## Configuration
+Place a `.smartcommitrc` file in your repo root. Gitbun picks it up automatically.
+## Troubleshooting
+Open the Output panel and select "Gitbun" channel for debug logs.

gitbun-vscode/eslint.config.mjs

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+import typescriptEslint from "typescript-eslint";
+
+export default [{
+    files: ["**/*.ts"],
+}, {
+    plugins: {
+        "@typescript-eslint": typescriptEslint.plugin,
+    },
+
+    languageOptions: {
+        parser: typescriptEslint.parser,
+        ecmaVersion: 2022,
+        sourceType: "module",
+    },
+
+    rules: {
+        "@typescript-eslint/naming-convention": ["warn", {
+            selector: "import",
+            format: ["camelCase", "PascalCase"],
+        }],
+
+        curly: "warn",
+        eqeqeq: "warn",
+        "no-throw-literal": "warn",
+        semi: "warn",
+    },
+}];