feat: add Pi provider support, fix community health files, recategorize /onboard

- Add first-class Pi (pi.dev) provider with transformer, tests, and build integration
- Fix CODEOWNERS username (@paulbakaus → @pbakaus)
- Add missing providers to issue/PR templates (Copilot, Kiro, OpenCode, Pi)
- Add Pi and OpenCode logos to homepage hero and install sections
- Move /onboard from "system" to "enhancement" category
- Update README and DEVELOP.md with all supported providers

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

scripts/build.js

@@ -25,7 +25,8 @@ import {
   transformCodex,
   transformAgents,
   transformKiro,
-  transformOpenCode
+  transformOpenCode,
+  transformPi
 } from './lib/transformers/index.js';
 import { createAllZips } from './lib/zip.js';
 import { execSync } from 'child_process';
@@ -147,7 +148,8 @@ function assembleUniversal(distDir, suffix = '') {
     { provider: 'codex', configDir: '.codex' },
     { provider: 'agents', configDir: '.agents' },
     { provider: 'kiro', configDir: '.kiro' },
-    { provider: 'opencode', configDir: '.opencode' }
+    { provider: 'opencode', configDir: '.opencode' },
+    { provider: 'pi', configDir: '.pi' }
   ];
 
   for (const { provider, configDir } of providerMappings) {
@@ -174,6 +176,7 @@ This folder contains skills for all supported tools:
   .agents/    → VS Code Copilot, Antigravity
   .kiro/      → Kiro
   .opencode/  → OpenCode
+  .pi/        → Pi
 
 To install, copy the relevant folder(s) into your project root.
 These are hidden folders (dotfiles) — press Cmd+Shift+. in Finder to see them.
@@ -306,6 +309,7 @@ async function build() {
   transformAgents(skills, DIST_DIR, patterns);
   transformKiro(skills, DIST_DIR, patterns);
   transformOpenCode(skills, DIST_DIR, patterns);
+  transformPi(skills, DIST_DIR, patterns);
 
   // Transform for each provider (prefixed with i-)
   const prefixOptions = { prefix: 'i-', outputSuffix: '-prefixed' };
@@ -316,6 +320,7 @@ async function build() {
   transformAgents(skills, DIST_DIR, patterns, prefixOptions);
   transformKiro(skills, DIST_DIR, patterns, prefixOptions);
   transformOpenCode(skills, DIST_DIR, patterns, prefixOptions);
+  transformPi(skills, DIST_DIR, patterns, prefixOptions);
 
   // Assemble universal directory (unprefixed and prefixed)
   assembleUniversal(DIST_DIR);