💥 boom: replace DataclassInstance with optype.HasDataclassFields

[nstarman]

Further simplification.

[Copilot]

Pull request overview

This PR removes the project’s custom DataclassInstance protocol and switches dataclass-related dispatch/type annotations to use optype.dataclasses.HasDataclassFields instead.

Changes:

• Removed DataclassInstance from dataclassish._src.types and from the top-level dataclassish exports.
• Updated dataclass dispatch registrations (get_field, replace, fields, asdict, astuple) to accept opt.dataclasses.HasDataclassFields.
• Adjusted a converters module docstring to no longer mention DataclassInstance.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
src/dataclassish/_src/types.py	Deletes the DataclassInstance protocol and updates __all__ accordingly.
src/dataclassish/_src/register_dataclass.py	Replaces DataclassInstance annotations with opt.dataclasses.HasDataclassFields for dispatch signatures.
src/dataclassish/_src/converters.py	Docstring wording update referencing “Dataclass instance” instead of DataclassInstance.
src/dataclassish/init.py	Removes DataclassInstance from the public package exports/imports.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.26%. Comparing base (841444a) to head (fadf8dd).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #78      +/-   ##
==========================================
- Coverage   97.32%   97.26%   -0.06%     
==========================================
  Files          12       12              
  Lines         299      293       -6     
==========================================
- Hits          291      285       -6     
  Misses          8        8              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.