feat: add CodeRabbit AI code review integration

- Add .coderabbit.yaml with minimal config and path instructions
- Exclude node_modules from review scope
- Document pilot research and conclusions in docs/planning/

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docs/web-bundles-gemini-gpt-guide.md

@@ -73,7 +73,7 @@ web-bundles/
 
 **Create a Gem:**
 
-1. Go to [Google AI Studio](https://aistudio.google.com/)
+1. Go to [Gemini Gem manager](https://gemini.google.com/gems/view)
 2. Click "New Gem" or "Create Gem"
 3. Give your Gem a name (e.g., "BMad PM Agent")
 4. **Enable "Code execution" for best results with document generation**

example-custom-content/README.md

@@ -2,3 +2,7 @@
 
 This is a demonstration of custom stand along agents and workflows. By having this content all in a folder with a custom.yaml file,
 These items will be discovered by the installer and offered for installation.
+
+This is how you could also create and share other custom agents and workflows not tied to a specific module.
+
+To see how these become installable, rename custom.bak -> custom.yaml and run the installer from the location you also have put this folder.

example-custom-module/mwm/README.md

@@ -2,3 +2,11 @@
 
 This module is an example and is not at all recommended for any usage, this module was not vetted by any medical professionals and should
 be considered at best for entertainment purposes only.
+
+IF you want to see how a custom module installation works, copy this whole folder to where you will be installing from with npx, and rename
+"\_module-installer/install-config.bak" to "\_module-installer/install-config.yaml".
+
+You should see the option in the module selector when installing.
+
+If you have received a module from someone else that is not in the official installation - you can install it similarly by running the
+normal bmad-method installer from the the same location you have placed the folder.