chore(release): bump app.py to 0.2.0

[clean6378-max-it]

CLoses #142

Release cut for v0.2.0. Stacks on #144, which already landed the [0.2.0] changelog on master.

This PR bumps app.py version from 0.2.0.dev0 to 0.2.0 and updates docs/deprecation-policy.md so it no longer pins the old dev suffix. git grep 0.2.0.dev0 should return nothing after merge.

There is no wheel or npm publish step.

After this merges, tag v0.2.0 on the release commit and create the GitHub Release with notes copied from the [0.2.0] section in CHANGELOG.md.

Summary by CodeRabbit

• Release

  • Updated the application version to 0.2.0.

• Documentation

  • Updated versioning guidance with the v0.2.0 release and clarified development-version suffix conventions.

[coderabbitai]

📝 Walkthrough

Walkthrough

The application version changed from 0.2.0.dev0 to 0.2.0, and the deprecation policy now documents v0.2.0 as shipped while generalizing development suffix wording.

Changes

Release version alignment

Layer / File(s)	Summary
Version constant and policy update app.py, docs/deprecation-policy.md	The application reports version 0.2.0, and the Versioning policy lists the v0.2.0 tag with generalized .dev0 development wording.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Suggested reviewers: timon0305

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the main change: bumping the app version to 0.2.0.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch release/v0.2.0

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