performancecopilot · tallpsmith · Jan 30, 2026 · Feb 13, 2026
diff --git a/CLAUDE.md b/CLAUDE.md
@@ -0,0 +1,108 @@
+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project Overview
+
+The Performance Co-Pilot (PCP) website at https://pcp.io. This is a static site generator built with Ruby, HAML templates, SASS/Compass for styling, and published to GitHub Pages.
+
+## Build System
+
+The site uses a custom Makefile-based build system with the following commands:
+
+- `make` - Clean and build the entire site (equivalent to `make clean default`)
+- `make default` - Build the site without cleaning (compiles HAML → HTML, SCSS → CSS)
+- `make check` - Run linkchecker to validate all links on the live site
+- `make clean` - Remove generated files
+
+The build process:
+1. Compiles Compass SCSS files to compressed CSS
+2. Converts HAML templates to HTML in the `docs/` directory
+3. Syncs images and documentation from the PCP git repository (../pcp)
+4. Syncs static assets (images, papers, GPG keys) to docs/
+5. Stages changes in git (does NOT commit)
+
+## Architecture
+
+### HAML Template Structure
+
+Each page is a standalone HAML file (e.g., `index.haml`, `features.haml`, `documentation.haml`) that includes shared components:
+- `assets/haml-includes/head.haml` - Common head metadata and CSS links
+- `assets/haml-includes/navigation.haml` - Global navigation header
+- `assets/haml-includes/footer.haml` - Site footer
+
+HAML files use Ruby's `Haml::Engine.new(File.read(...)).render` pattern to include shared components.
+
+### Directory Layout
+
+- Root `.haml` files → compiled to `docs/*.html`
+- `gsoc/`, `gsod/`, `conference/` subdirectories contain year-specific HAML files
+- `assets/` - CSS, JavaScript, and HAML includes
+- `compass/config.rb` - Compass configuration for SCSS compilation
+- `docs/` - Output directory (published to GitHub Pages)
+- `images/`, `snaps/`, `papers/` - Static assets synced to docs/
+
+### External Dependencies
+
+The build expects a sibling PCP git repository at `../pcp` containing:
+- `images/` - Synced to the website's images directory
+- `html/*` - Documentation files synced to `docs/docs`
+
+This dependency is checked with `test -d` in the Makefile and skipped if not present.
+
+## Release Process
+
+See `NEWRELEASE` for the full process. Website updates for new releases:
+
+1. Edit `index.haml` - Replace the last news item with the new release announcement
+2. Run `make` to build the site
+3. The Makefile runs `git add docs && git status` but does NOT commit
+4. Manually commit and push changes
+
+## Styling
+
+- Built with Sassaparilla CSS framework
+- Uses Compass with sass-globbing
+- SCSS precision set to 7 for Chrome compatibility
+- CSS compiled to `assets/css/` with compressed output style
+- Main stylesheets: `assets/css/screen.scss` and `assets/css/main.scss`
+
+## Development Setup
+
+Prerequisites (from README):
+- Ruby with development headers
+- rubygem-haml
+- sass-globbing and compass gems (`gem install sass-globbing compass`)
+- lynx, rsync, linkchecker (for validation)
+
+After changes to HAML or SCSS files, run `make` to rebuild the site. The output in `docs/` is what gets published to GitHub Pages.
+
+## Ruby Version Management
+
+**CRITICAL:** This project requires Ruby 3.1.6 due to legacy gem compatibility. Modern Ruby versions (3.2+) will fail.
+
+### Setup with rbenv (macOS)
+
+```bash
+brew install rbenv ruby-build
+eval "$(rbenv init - zsh)"  # Add to ~/.zshrc
+rbenv install 3.1.6
+rbenv global 3.1.6
+gem install haml -v 5.2.2
+gem install compass sass-globbing
+rbenv rehash
+```
+
+### Version Requirements
+
+- Ruby: 3.1.6 (last version compatible with Compass 1.0.3)
+- haml: 5.2.2 (haml 6.x has breaking changes)
+- compass: 1.0.3 (requires Ruby < 3.2, uses deprecated File.exists?)
+- sass-globbing: 1.1.5+
+
+### Troubleshooting
+
+- `File.exists?` error → Using Ruby 3.2+, downgrade to 3.1.6
+- `to_hash` error → Using haml 6.x, downgrade to 5.2.2
+- `compass: command not found` → Run `rbenv rehash` after gem install
+- Compass deprecation warnings about interpolation → Safe to ignore
diff --git a/docs/download.html b/docs/download.html
@@ -125,9 +125,12 @@ <h3>Solaris</h3>
 <div class='col__module--img'>
 <img src='/images/macosx.png'>
 <h3>macOS</h3>
+<pre>
+  brew tap performancecopilot/performancecopilot&#x000A;brew install --cask pcp</pre>
 <p>
+Alternatively, download the
 <a href='https://github.com/performancecopilot/pcp/releases'>DMG installer</a>
-links
+from GitHub releases.
 </p>
 </div>
 </div>

diff --git a/download.haml b/download.haml
@@ -88,9 +88,14 @@
                 %div{:class => 'col__module--img'}
                   %img{:src => '/images/macosx.png'}
                   %h3 macOS
-                  %p 
+                  %pre
+                    :preserve
+                      brew tap performancecopilot/performancecopilot
+                      brew install --cask pcp-perf
+                  %p
+                    Alternatively, download the
                     %a{:href => 'https://github.com/performancecopilot/pcp/releases'} DMG installer
-                    links
+                    from GitHub releases.
 
               %div{:class => 'colspan12-6 colspan8-4 colspan6-3 colspan2-2 as-grid with-gutter'}
                 %div{:class => 'col__module--img'}