feat(coding-agent): configurable app name and config dir for forks (#95)

- Add piConfig to package.json for app name and config directory
- Consolidate paths.ts into config.ts with clearer naming
- Fix Bun binary detection (changed from %7EBUN to $bunfs)
- Update all hardcoded paths to use config.ts exports
- getThemesDir() for built-in themes, getCustomThemesDir() for user themes

packages/coding-agent/CHANGELOG.md

@@ -2,6 +2,14 @@
 
 ## [Unreleased]
 
+### Added
+
+- **Forking/Rebranding Support**: All branding (app name, config directory, environment variable names) is now configurable via `piConfig` in `package.json`. Forks can change `piConfig.name` and `piConfig.configDir` to rebrand the CLI without code changes. Affects CLI banner, help text, config paths, and error messages. ([#95](https://github.com/badlogic/pi-mono/pull/95))
+
+### Fixed
+
+- **Bun Binary Detection**: Fixed Bun compiled binary failing to start after Bun updated its virtual filesystem path format from `%7EBUN` to `$bunfs`. ([#95](https://github.com/badlogic/pi-mono/pull/95))
+
 ## [0.12.4] - 2025-12-02
 
 ### Added