mono - feat: moving to tsdown for build

[jaredwray]

Please check if the PR fulfills these requirements

• Followed the Contributing and Code of Conduct guidelines.
• Tests for the changes have been added (for bug fixes/features) with 100% code coverage.

What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
mono - feat: moving to tsdown for build

[gemini-code-assist]

Code Review

This pull request migrates the build system from tsup to tsdown across the monorepo, updating build scripts and output file extensions while adding package-specific configurations. Feedback suggests retaining esbuild in the onlyBuiltDependencies whitelist as it remains a transitive dependency of other tools in the stack. Additionally, it is recommended to implement a shared base configuration for tsdown to reduce redundancy and improve maintainability across the multiple packages.

[chatgpt-codex-connector]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (6c3303a) to head (831645b).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #1926      +/-   ##
===========================================
+ Coverage   99.94%   100.00%   +0.05%     
===========================================
  Files          40        40              
  Lines        3983      3983              
  Branches      639       643       +4     
===========================================
+ Hits         3981      3983       +2     
+ Misses          2         0       -2     

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