Read a contiguous span of a file, addressed by anchors (primary) or line numbers (fallback). Streams large files and returns a content_hash for staleness-guarded edits.

Replace a contiguous span of a file with new content, addressed by anchors (primary) or line numbers (fallback). Optional expected_content_hash guards against stale edits; writes atomically. IMPORTANT: the from_anchor line and the to_anchor line are BOTH included in the replaced span — they are consumed, not preserved. If you want to keep the boundary lines, you must include them verbatim in new_content. Common mistake: anchoring on the last line of content you want to keep and then omitting it from new_content — that line will be silently dropped.

Insert content before or after a single target line (anchor or line number) without replacing existing content. Writes atomically.

Insert content at the very beginning of a file (byte concatenation). Optional ensure_newline_after. Writes atomically.

Append content to the end of a file (byte concatenation). Optional ensure_newline_before. Writes atomically.

Remove all Git merge conflict markers (<<<<<<< , =======, >>>>>>>) from a file in a single operation, keeping both sides of every conflict. Reports which lines the markers were on and how many conflicts were resolved. Writes atomically.