Initial shared Copilot resources scaffold

docs/setup.md

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+# Setup
+
+## macOS Or Linux
+
+```bash
+install/bootstrap.sh
+```
+
+## Windows
+
+```powershell
+install/bootstrap.ps1
+```
+
+## What Bootstrap Does
+
+- Creates a canonical path at `~/.copilot-resources`
+- Links default discovery locations back to this repository
+- Merges only the managed Copilot-related VS Code settings into the user settings file
+- Writes a managed Copilot CLI environment fragment and sources it from the shell or PowerShell profile
+- Writes a local install-state file outside the repository
+
+## Optional Settings
+
+Bootstrap renders and merges the managed keys from
+`config/vscode/settings.template.jsonc` into the user settings file. Existing
+unmanaged VS Code settings are preserved.
+
+Bootstrap also writes a managed Copilot CLI environment file into the local
+state directory and adds a small managed source block to the active shell or
+PowerShell profile instead of replacing the whole profile.