feat(tools): make key argument width adaptive to terminal size

[zdyxry]

Related Issue

#799

Description

Checklist

• I have read the CONTRIBUTING document.
• I have linked the related issue, if any.
• I have added tests that prove my fix is effective or that my feature works.
• I have run make gen-changelog to update the changelog.
• I have run make gen-docs to update the user documentation.

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

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[Copilot]

Pull request overview

This PR makes the key-argument display width adaptive to the current terminal size, improving the readability of tool call summaries in the CLI.

Changes:

• Introduced _get_key_argument_width() in kimi_cli.tools to compute a dynamic key-argument width based on shutil.get_terminal_size, with sensible min/max bounds and error handling.
• Extended extract_key_argument() with an optional, keyword-only width parameter and wired it to use _get_key_argument_width() when width is not provided.
• Added a dedicated test module tests/tools/test_extract_key_argument.py covering _get_key_argument_width() behavior across terminal widths and validating extraction/truncation logic for multiple tools and error cases.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/kimi_cli/tools/init.py	Adds adaptive key-argument width calculation and integrates it into extract_key_argument while preserving existing behavior and call sites.
tests/tools/test_extract_key_argument.py	Provides focused unit tests for the new width helper and extract_key_argument across various tools, terminal sizes, and failure scenarios.

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