feat: mark nvm as an installation method for AIX

[MattIPv4]

Description

When selecting AIX on the site, no installation methods are available currently. It was confirmed that nvm works on AIX, so let's enable that.

Validation

Select AIX on the downloads page, observe nvm selectable.

Related Issues

Fixes #8638

Check List

• I have read the Contributing Guidelines and made commit messages that follow the guideline.
• I have run pnpm format to ensure the code follows the style guide.
• I have run pnpm test to check if all tests are passing.
• I have run pnpm build to check if the website builds without errors.
• I've covered new added functionality with unit tests if necessary.

[vercel]

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Project	Deployment	Actions	Updated
nodejs-org	Ready	Preview	Oct 9, 2026 4:37pm UTC

[Copilot]

🟡 Changes recommended

The PR would close #8638 without addressing its primary request to hide incompatible dropdown options.

1 open finding

• Filter incompatible dropdown options or correct the linked issue · New

What changed in this PR

Enables nvm as an installation method for AIX.

Changes:

• Adds AIX to nvm’s supported operating systems.

File	Description
apps/​site/​util/​download/​constants.json	Enables nvm selection for AIX.

🧠 Review effort: Balanced

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.00%. Comparing base (bbbdde7) to head (d8b63a4).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9211      +/-   ##
==========================================
- Coverage   86.07%   86.00%   -0.07%     
==========================================
  Files          86       86              
  Lines        6060     6060              
  Branches      359      360       +1     
==========================================
- Hits         5216     5212       -4     
- Misses        840      844       +4     
  Partials        4        4              

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[richardlau]

LGTM. Meets IBM's suggestion for AIX from #8638 (comment). Thank you.

[github-actions]

📦 Build Size Comparison

Summary

Metric	Value
Old Total First Load JS	7.15 MB
New Total First Load JS	7.15 MB
Delta	24.00 B (0.00%)

Changes

🔄 Modified Routes (4)

Route	Old First Load JS	New First Load JS	Delta
/[locale]	1.68 MB	1.68 MB	📈 6.00 B (0.00%)
/[locale]/[...path]	1.68 MB	1.68 MB	📈 6.00 B (0.00%)
/[locale]/blog/[...path]	1.68 MB	1.68 MB	📈 6.00 B (0.00%)
/[locale]/download/archive/[version]	1.68 MB	1.68 MB	📈 6.00 B (0.00%)