fix(argparse): use arena allocation and call flush() for writer with buffer

[Noai-oss]

Summary by CodeRabbit

• Bug Fixes
  • Improved command-line help output by ensuring all printed content is flushed before exiting.
  • Updated argument parsing memory handling for improved reliability and more consistent command execution.
  • Removed outdated command-line argument guidance to keep help-related behavior current.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 79234493-bd8b-4030-9dc2-9089f72abde6

📥 Commits

Reviewing files that changed from the base of the PR and between 4dedd64 and 3efb187.

📒 Files selected for processing (1)

• assets/src/13-01.zig

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📝 Walkthrough

Walkthrough

main now uses the initialization arena allocator for argument parsing. Help output explicitly flushes the writer after printHelp completes.

Changes

CLI resource handling

Layer / File(s)	Summary
Allocator and output handling assets/src/13-01.zig	Argument parsing uses init.arena.allocator() instead of init.gpa. The output writer flushes after printHelp.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Merge Risk: ⚪ Minimal · up to 3efb1

This localized change is merge-ready after normal checks and review; no actionable merge-blocking risk remains.

Suggested reviewers: jiacai2050, xihale

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes both main changes: arena allocation for argument parsing and flushing the buffered writer.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (1 skipped: 1 unsupported.)
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

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