- Implemented in-house, zero-dependency utility modules in `pi-utils` covering DOM manipulation, markdown parsing, templating, browser automation helpers, and terminal buffers.
- Migrated packages across the repository to consume the new internal utilities and `omptype` schema validators instead of external dependencies.
- Removed multiple external runtime and development dependencies including Zod, Marked, LRU cache, Turndown, and Puppeteer browser packages.
- Added native `FileLock` bindings supporting cross-process advisory locking on Linux, Unix, and Windows.
- Replaced directory-based file locking and custom stale-lock reclamation with OS-backed native locks.
- Updated TypeScript declarations, native bindings, and package documentation for the new API.
- Added comprehensive unit tests and fixtures validating single-owner constraints and process death handoff.
Scoped test-runtime detection to explicit runner markers and Bun test entrypoints, so application NODE_ENV/BUN_ENV values no longer make ProcessTerminal headless.
Added subprocess regression coverage and propagated the private marker to test children.
Fixes#7261
can1357