Expose public API in dir(impulso) via __dir__

[niall-stack]

Summary\nAdds a module-level dir in src/impulso/init.py so interactive discovery tools and IDE completion include all public API names from all.\n\nAlso adds a focused test in ests/test_public_api.py to ensure each all symbol appears in dir(impulso).\n\n## Why\nFixes #25 (getattr does not update dir).\n\n## Validation\nI added/updated tests for this behavior.\n\nNote: I could not run pytest locally in this environment because no Python runtime is installed on host (py -3.11 reported no suitable runtime).

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.9%. Comparing base (cfe95cc) to head (c54aa67).
⚠️ Report is 1 commits behind head on main.

❌ Your project status has failed because the head coverage (88.9%) is below the target coverage (90.0%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@          Coverage Diff          @@
##            main     #28   +/-   ##
=====================================
  Coverage   88.9%   88.9%           
=====================================
  Files         16      16           
  Lines        651     653    +2     
  Branches      83      83           
=====================================
+ Hits         579     581    +2     
  Misses        53      53           
  Partials      19      19           

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[thomaspinder]

Thanks for opening this PR. It looks like the PR branch is stale, so I think you'll just need to rebase the PR. Once rebased, you'll need to add all entities into __all__