chore: prepare 0.6.1rc3

[utensil]

Summary

• bump the package version from 0.6.1rc2 to 0.6.1rc3
• leave the changelog and final-release marker unchanged

Motivation

v0.6.1rc2 validated GitHub Actions, PyPI trusted publishing, installation, and Read the Docs, but it did not produce a Zenodo record. After reconnecting the GitHub–Zenodo integration, rc3 provides a fresh immutable tag and package version for another end-to-end release-pipeline check.

Verification

• package version assertion: 0.6.1rc3
• sdist and wheel build successfully with rc3 filenames
• git diff --check passes

Refs #588.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.90%. Comparing base (a508811) to head (93aaa92).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #601   +/-   ##
=======================================
  Coverage   73.90%   73.90%           
=======================================
  Files          23       23           
  Lines        4518     4518           
=======================================
  Hits         3339     3339           
  Misses       1179     1179           

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