fix(tools): use LF line endings in generate_tool_specs.py on Windows

[NIK-TIGER-BILL]

Problem

On Windows, Python's open() in text mode uses CRLF (\r\n) line endings by default. Running generate_tool_specs.py on Windows regenerates tool.specs.json with CRLF, causing every line to appear modified in git diff even though content is unchanged.

Fix

Pass newline="\n" to open() in save_to_json() to force LF line endings regardless of the operating system:

# Before
with open(output_path, "w", encoding="utf-8") as f:

# After
with open(output_path, "w", encoding="utf-8", newline="\n") as f:

Fixes #4737

---

Note

Low Risk
Low risk: a single file-write option change that only affects newline normalization in generated JSON output.

Overview
Ensures ToolSpecExtractor.save_to_json() opens the output file with newline="\n", so regenerating tool.specs.json on Windows uses LF instead of CRLF and avoids whole-file diff churn.

^{Written by Cursor Bugbot for commit 8e936f9. This will update automatically on new commits. Configure here.}