deleteAdjacentChip and insert did getSelection()/Range work inside the
component, which pushed it over the max-lines budget under a disable
comment. rich-text-dom.ts already owns the DOM boundary, so the surgery
moves there as two new exports, chipAtCaret and insertChipAtCaret, and
the component keeps only its event-handling and output concerns.
adjacentChip stays exported with its own spec case. The component
disable comment is gone, since the file is now under the line budget.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
