fix(async): revert Promise.all refactor

[avivkeller]

During my hotfix, I appear to have accidentally changed a for-loop to a Promise.all (in my attempt to use .map)

That was not needed, so this is a revert of it.

cc @ovflowd

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Project	Deployment	Preview	Updated (UTC)
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[codecov]

Codecov Report

❌ Patch coverage is 47.82609% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.76%. Comparing base (06f981e) to head (0200966).
⚠️ Report is 3 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/generators/ast/index.mjs	0.00%	12 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #515      +/-   ##
==========================================
- Coverage   80.79%   80.76%   -0.03%     
==========================================
  Files         119      119              
  Lines       11864    11877      +13     
  Branches      843      841       -2     
==========================================
+ Hits         9586     9593       +7     
- Misses       2275     2281       +6     
  Partials        3        3              

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[Copilot]

Pull request overview

This PR reverts an accidental refactoring that changed sequential file processing to parallel processing using Promise.all. The change restores the original for-loop approach in both AST generators.

• Reverts Promise.all() parallel processing back to sequential for...of loops
• Updates both markdown AST generator (ast/index.mjs) and JavaScript AST generator (ast-js/index.mjs) for consistency

Reviewed changes

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

File	Description
src/generators/ast/index.mjs	Reverts processChunk method from Promise.all with parallel map to sequential for-loop for processing markdown files
src/generators/ast-js/index.mjs	Reverts processChunk method from Promise.all with parallel map to sequential for-loop for processing JavaScript files

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