feat: introduce GitHub Copilot Chat adapter using official BMAD prompt artifacts

bmad-copilot/.gitignore

@@ -0,0 +1,8 @@
+node_modules/
+dist/
+out/
+releases/
+*.vsix
+*.tgz
+.DS_Store
+Thumbs.db

bmad-copilot/.npmignore

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+# Source
+src/
+*.ts
+!dist/**/*.d.ts
+
+# Development
+.vscode/
+.github/
+out/
+node_modules/
+scripts/
+releases/
+
+# Testing
+TESTING.md
+*.vsix
+
+# Config
+tsconfig.json
+.vscodeignore
+.eslintrc*
+.prettierrc*
+.gitignore
+.editorconfig

bmad-copilot/.vscode/launch.json

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+{
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "name": "Run Extension",
+      "type": "extensionHost",
+      "request": "launch",
+      "args": [
+        "--extensionDevelopmentPath=${workspaceFolder}"
+      ],
+      "outFiles": [
+        "${workspaceFolder}/dist/**/*.js"
+      ],
+      "preLaunchTask": "npm: compile"
+    },
+    {
+      "name": "Run Extension (Watch)",
+      "type": "extensionHost",
+      "request": "launch",
+      "args": [
+        "--extensionDevelopmentPath=${workspaceFolder}"
+      ],
+      "outFiles": [
+        "${workspaceFolder}/dist/**/*.js"
+      ],
+      "preLaunchTask": "npm: watch"
+    }
+  ]
+}

bmad-copilot/.vscode/tasks.json

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+{
+  "version": "2.0.0",
+  "tasks": [
+    {
+      "type": "npm",
+      "script": "compile",
+      "group": {
+        "kind": "build",
+        "isDefault": true
+      },
+      "problemMatcher": "$tsc",
+      "label": "npm: compile"
+    },
+    {
+      "type": "npm",
+      "script": "watch",
+      "group": "build",
+      "problemMatcher": "$tsc-watch",
+      "isBackground": true,
+      "label": "npm: watch"
+    }
+  ]
+}

bmad-copilot/.vscodeignore

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+.vscode/**
+.github/**
+src/**
+out/**
+releases
+releases/**
+scripts/**
+node_modules/**
+tsconfig.json
+.gitignore
+.npmignore
+TESTING.md
+*.vsix