restoreIndentForPairedReplacement() and restoreLeadingIndent() unconditionally
restored original indentation when replacement had none, preventing intentional
indentation changes (e.g. removing a tab from '\t1절' to '1절'). Skip indent
restoration when trimmed content is identical, indicating a whitespace-only edit.
- Track matchedLen separately for stripped continuation token matches
- Map fuzzy index back to original string position via character-by-character
scan that skips operator chars, fixing positional correctness
- maybeExpandSingleLineMerge now uses stripTrailingContinuationTokens and
stripMergeOperatorChars as fallback matching strategies
- Add 'refs interpreted against last read' atomicity clause to tool description
- Add 'output tool calls only; no prose' rule to tool description
- Rewrite restoreOldWrappedLines to use oh-my-pi's span-scanning algorithm
- Add stripTrailingContinuationTokens and stripMergeOperatorChars helpers
- Fix detectLineEnding to use first-occurrence logic instead of any-match
- Fix applyAppend/applyPrepend to replace empty-line placeholder in empty files
- Enhance tool description with 7 critical rules, tag guidance, and anti-patterns
