fix(legacy-json): use leftHandAssign in more cases

[avivkeller]

Previously, a plural of ctor was added to the JSON object as signatures. However, each ctor was treated like a method, which allowed it to have its own sub-signatures.

1. This PR updates the logic so that ctor cannot have "sub-signatures". Instead, these are added to the existing section object.
2. This PR replaces an Object.assign with a leftHandAssign, since it was previously overwriting important keys.

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Review	Updated (UTC)
api-docs-tooling	Ready	Preview	Dec 19, 2025 11:44pm

[codecov]

Codecov Report

❌ Patch coverage is 85.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.86%. Comparing base (e6e3f43) to head (eaaaac7).
⚠️ Report is 2 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/generators/legacy-json/utils/parseList.mjs	50.00%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #525   +/-   ##
=======================================
  Coverage   79.86%   79.86%           
=======================================
  Files         121      121           
  Lines       11995    12011   +16     
  Branches      839      840    +1     
=======================================
+ Hits         9580     9593   +13     
- Misses       2412     2415    +3     
  Partials        3        3           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[Copilot]

Pull request overview

This PR fixes a double-signature issue in the legacy JSON generator where constructor (ctor) sections were incorrectly nested with sub-signatures. The fix ensures that constructor signature properties are directly merged into the section object rather than wrapped in a signatures array.

Key Changes:

• Added an explicit case 'ctor' handler that merges signature properties directly into the section object using nullish coalescing assignment
• Prevents constructors from having nested "sub-signatures" like methods do

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[ovflowd]

SGTM!