apply_final_call_ids iterated over all final tool calls, including
non-file-edit tools like read_file. The greedy path-match in
matches_final_tool_call could overwrite a correct unique id with a
stale one from a different streaming state, producing duplicate
tool_use ids that poison the persisted session.
Guard the loop with is_file_edit_tool() so only tracked file-edit
tools (write_file, edit_file, apply_patch) are subject to canonical
id remapping. Non-file-edit tools keep their authoritative id from
get_final_message().
Fixes#4595
Drop the legacy unified-diff patch parameter and all related parsing/
generation logic (_parse_patch, _generate_patch, _apply_hunks, etc.).
The tool now accepts only the structured `edits` array, eliminating the
intermediate diff-string round-trip.
Also update file_edit_events tracking and tests to work exclusively
with edits.
Benchmark (zhipu glm-5.1, edits mode): 15/15 cases passed.
axelray-devandXubin Ren
chengyongruandXubin Ren