- Update 26+ files to import secureFs from @automaker/platform
- Create shared type files: github.ts, worktree.ts, claude.ts in libs/types
- Create exec-utils.ts for cross-platform shell execution
- Delete redundant wrapper files: secure-fs.ts, stream-processor.ts, enhancement-prompts.ts
- Update GitHub routes to use createLogError pattern
- Add isENOENT helper to routes/common.ts
- Fix test imports to use @automaker/prompts and @automaker/platform
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>