- A blank run at EOF now breaks the list without consuming the blank,
matching real marked: '- item\n\n' lexes as a tight list plus a space
token instead of a loose list whose raw includes the blank.
- Completes the 17.2.10 mid-document fix; same-marker continuation and
indented item content across blanks are unaffected.
- Added list/blank boundary token-shape tests (verified against marked
v15) since the tui incremental tests compare the lexer to itself.
- 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.
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