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>

.github/CODEOWNERS

@@ -1,8 +1,8 @@
 # Global ownership — auto-request review from Paul on every PR
-* @paulbakaus
+* @pbakaus
 
 # Build system
-scripts/ @paulbakaus
+scripts/ @pbakaus
 
 # Source content (skills & commands)
-source/ @paulbakaus
+source/ @pbakaus

.github/ISSUE_TEMPLATE/bug_report.md

@@ -22,7 +22,7 @@ assignees: ''
 
 ## Provider & environment
 
-- **Provider** (Cursor / Claude Code / Gemini CLI / Codex): 
+- **Provider** (Cursor / Claude Code / Gemini CLI / Codex / Copilot / Kiro / OpenCode):
 - **Provider version**: 
 - **OS**: 
 

.github/ISSUE_TEMPLATE/feature_request.md

@@ -20,6 +20,9 @@ assignees: ''
 - [ ] Claude Code
 - [ ] Gemini CLI
 - [ ] Codex CLI
+- [ ] VS Code Copilot
+- [ ] Kiro
+- [ ] OpenCode
 - [ ] All providers
 
 ## Alternatives considered

.github/PULL_REQUEST_TEMPLATE.md

@@ -17,5 +17,5 @@
 - [ ] Source files updated in `source/`
 - [ ] `bun run build` ran successfully
 - [ ] `bun test` passes
-- [ ] Tested with at least one provider (Cursor / Claude Code / Gemini CLI / Codex)
+- [ ] Tested with at least one provider (Cursor / Claude Code / Gemini CLI / Codex / Copilot / Kiro / OpenCode)
 - [ ] README / DEVELOP.md updated if needed