Instructions for apply_patch.cs extended

AGENTS.md

@@ -32,8 +32,11 @@ It supports the standard `git diff` patch files as input. You should be able to
 * `--ignore-line-endings`
 * `--target` - allows specifying target root directory for the patch
 
-* Build patches in standard `git diff` format. It doesn't support `***` format.
-* Build patches in small, line-precise hunks; confirm target lines with Get-Content before writing the diff to avoid context mismatches.
+* Build patches in standard `git diff` format.
+    * It supports `---`, `+++`, and `@@`.
+    * It doesn't support `***` or `*** Begin/End Patch` wrappers.
+    * It requires `diff --git` at the beginning.
+* Build patches in small, line-precise hunks; confirm target lines with `Get-Content` or `nl -ba` before writing the diff to avoid context mismatches.
 * Regenerate the diff whenever the file shifts—never reuse an old hunk after other edits.
 * Keep patch filenames unique and delete applied files to prevent accidental re-use.
 * When a hunk fails, inspect the around-lines immediately and adjust rather than retrying the same diff.