Bump version to 2.1.0

[bobbypaton]

Prepares the 2.1.0 release: version 2.1.0 in dbstep/__init__.py and meta.yaml, and the changelog's Unreleased section dated as 2.1.0 (adds the ghost-atom fix from #53 under Fixed).

After merging, publish a GitHub Release from master with tag 2.1.0. The conda recipe sha256 follows once the sdist is on PyPI, as for 1.2.0 and 2.0.0.

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Generated by Claude Code

Summary by CodeRabbit

• Release
  • Version 2.1.0 is now available, with the existing release additions retained.
• Bug Fixes
  • Zero-radius ghost atoms no longer occupy a grid point.

[coderabbitai]

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Essentials

Run ID: 0d30749b-379d-4e6e-a228-2ae2df2a6023

📥 Commits

Reviewing files that changed from the base of the PR and between cd5b977 and f4eddb6.

📒 Files selected for processing (3)

• CHANGELOG.md
• dbstep/__init__.py
• meta.yaml

Included review availability: 4 reviews are currently available. Your included PR review attempts over the past 7 days set your current allowance at 5 reviews per hour.

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📝 Walkthrough

Walkthrough

The changelog now identifies the dated 2.1.0 release and records a fix for zero-radius ghost atoms. The package version and recipe version both change from 2.0.0 to 2.1.0.

Changes

Release metadata

Layer / File(s)	Summary
Release notes and version declarations CHANGELOG.md, dbstep/__init__.py, meta.yaml	The changelog identifies the 2.1.0 release and records the ghost-atom fix. The package and recipe versions change to 2.1.0.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~4 minutes

Change: Other

Suggested reviewers: claude

Merge Risk: ⚪ Minimal · up to f4edd

The release metadata is consistent, and the zero-radius ghost-atom fix matches the checked implementation. No actionable merge-blocking risk remains.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: preparing release version 2.1.0 across the package metadata and changelog.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 1…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

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🧪 Generate unit tests (beta)

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