Fix formatDocPageAsMan() mislabeling untitled sections as OPTIONS

[dahlia]

Summary

formatDocPageAsMan() used section.title?.toUpperCase() ?? "OPTIONS" as the fallback heading for untitled sections, so sections containing only commands or only arguments were still labeled .SH OPTIONS. This patch adds an inferSectionTitle() helper in packages/man/src/man.ts that inspects entry kinds before choosing the fallback: untitled command-only sections now render as COMMANDS, untitled argument-only sections render as ARGUMENTS, and mixed or option-only sections keep the existing OPTIONS label.

For example, a parser with two subcommands and no explicit section title previously produced:

.SH OPTIONS
.TP
\fBbuild\fR
Build project.
.TP
\fBtest\fR
Run tests.

After this fix, the same parser produces:

.SH COMMANDS
.TP
\fBbuild\fR
Build project.
.TP
\fBtest\fR
Run tests.

Fixes #261

Test plan

• Added tests in packages/man/src/man.test.ts for untitled command-only, argument-only, option-only, and mixed sections
• Verified all existing man page tests still pass

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[dahlia]

@codex review

[codecov]

Codecov Report

❌ Patch coverage is 92.85714% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 94.88%. Comparing base (63d2a50) to head (5e0c977).
⚠️ Report is 10 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
packages/man/src/man.ts	92.85%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #601      +/-   ##
==========================================
+ Coverage   94.87%   94.88%   +0.01%     
==========================================
  Files          38       38              
  Lines       17160    17233      +73     
  Branches     4518     4528      +10     
==========================================
+ Hits        16280    16352      +72     
- Misses        868      869       +1     
  Partials       12       12              

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 1d1383b7-3379-46ac-ba3c-2adf2e59b605

📥 Commits

Reviewing files that changed from the base of the PR and between 8404ed9 and 5e0c977.

📒 Files selected for processing (3)

• CHANGES.md
• packages/man/src/man.test.ts
• packages/man/src/man.ts

---

Walkthrough

This pull request fixes a bug in formatDocPageAsMan() where untitled sections in man page documentation were always labeled as "OPTIONS" regardless of their entry kinds. The fix introduces an inferSectionTitle() utility function that inspects entry kinds to infer appropriate section headings: "COMMANDS" for command-only sections, "ARGUMENTS" for argument-only sections, and "OPTIONS" as a fallback. The formatter now uses this function for untitled sections. Corresponding tests are added to validate the new behavior, and changelog entries document the fix for issues #261 and #601.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• generateManPage*(): forward brief, description, and footer from Program metadata #598: Modifies formatDocPageAsMan in packages/man/src/man.ts for NAME/DESCRIPTION/FOOTER metadata handling, representing a related code-level change to the same formatter function.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main fix: addressing the mislabeling of untitled sections in formatDocPageAsMan().
Description check	✅ Passed	The description is well-detailed and directly related to the changeset, explaining the problem, solution, example outputs, and test plan.
Linked Issues check	✅ Passed	The PR implements all coding requirements from issue #261: inferring section titles based on entry kinds for untitled sections and using appropriate headings (COMMANDS for command-only, ARGUMENTS for argument-only, OPTIONS otherwise).
Out of Scope Changes check	✅ Passed	All changes are directly related to fixing issue #261: the inferSectionTitle() utility, updated formatDocPageAsMan() logic, and comprehensive tests for heading inference.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/issue-261-man-untitled-sections

📝 Coding Plan

• Generate coding plan for human review comments

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Codex Review: Didn't find any major issues. 🎉

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