chore: migrating to tsdown and upgrading typescript

[jaredwray]

No description provided.

[gemini-code-assist]

Code Review

This pull request migrates the build system from tsup to tsdown, upgrades TypeScript to version 6.0.2, and updates the package version to 1.2.0. The package exports have been refined to support dual-module formats with explicit type definitions for ESM and CJS. I have no feedback to provide.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (a0bc2df) to head (9ea0da3).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #37   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines           19        19           
  Branches         1         1           
=========================================
  Hits            19        19           

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Restore prepare build hook for git/local installs

Replacing prepare with prepublishOnly means the build no longer runs when this package is installed from a git URL or local path, because npm/pnpm only run prepublishOnly on publish while prepare runs before packing/installing git dependencies. Since this repo does not commit dist/ but package entry points (main/exports) all target dist/*, those install paths now produce an unbuilt package that fails at runtime with missing module files.

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