[diffs/edit] Fix PieceTable CRLF metadata and resulting search range drift

[ije]

PieceTable CRLF line metadata (5, spanning piece-table and search
coverage) — line-break bookkeeping goes stale when a CRLF pair is split or
assembled across edits (deleting exactly the \n of a pair, inserting between
the \r and \n, assembling CRLF from two separate inserts, plus a
CRLF-biased fuzz oracle), and the same stale metadata drives search astray
(shifted or missing match ranges) even though getText() stays correct.

Fixed PieceTable CRLF metadata and resulting search range drift.

• Piece/tree metadata now reconciles CRLF pairs across piece seams while preserving lone \r breaks.
• Prevented unsafe coalescing across separately appended CRLF boundaries.

[vercel]

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[ije]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Can't wait for the next one!

Reviewed commit: 85b52ef208

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