release: 0.2.1

[chaoming0625]

Summary

Prepare the 0.2.1 maintenance release.

• Bump braintrace/_version.py from 0.2.0 → 0.2.1.
• Add a ## Version 0.2.1 section to changelog.md.

0.2.1 is a maintenance release that restores compatibility with the latest
brain-ecosystem dependencies and toolchain (brainstate 0.5, saiunit/
brainunit 0.5.1, pytest 9.1), shipped in #102. There are no functional
or public-API changes — code written against 0.2.0 works unchanged.

The Publish workflow verifies the release tag matches braintrace/_version.py,
so this bump is required before tagging v0.2.1.

Verification

From #102, verified locally: full suite 1367 passed (2 xfailed), mypy clean
across 51 files, and wheel + sdist build with py.typed shipped (PEP 561).

Summary by Sourcery

Prepare the 0.2.1 maintenance release to restore compatibility with updated brain-ecosystem dependencies and testing/tooling stack.

Bug Fixes:

• Restore compatibility with brainstate 0.5, saiunit/brainunit 0.5.1, and pytest 9.1 without changing public APIs or behavior.

Enhancements:

• Document the 0.2.1 maintenance release details, including dependency compatibility updates and verification status, in the changelog.

Build:

• Bump the internal package version from 0.2.0 to 0.2.1 for the new release.

[sourcery-ai]

Reviewer's Guide

Prepares the 0.2.1 maintenance release by bumping the internal version constant and documenting the dependency-compatibility fixes and verification details in the changelog, without introducing any functional or public-API changes.

Sequence diagram for publish workflow version verification

sequenceDiagram
    participant Developer
    participant GitTag as Git_tag_v0_2_1
    participant Repo as braintrace_repo
    participant CI as Publish_workflow

    Developer->>Repo: Update __version__ to 0.2.1
    Developer->>Repo: Update changelog Version_0_2_1 section
    Developer->>GitTag: Create tag v0.2.1
    GitTag->>CI: Trigger publish workflow
    CI->>Repo: Read braintrace/_version.py __version__
    CI->>GitTag: Read tag name v0.2.1
    CI-->>CI: [compare version to tag]
    CI-->>Developer: Publish release if versions match

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File-Level Changes

Change	Details	Files
Bump the package version constant to 0.2.1 to align with the planned release tag and publish workflow checks.	Update the hard-coded version string from 0.2.0 to 0.2.1 Keep version_info derived from the updated version without other logic changes	braintrace/_version.py
Document the 0.2.1 maintenance release, focusing on dependency compatibility fixes and test/typing verification, while clarifying that there are no behavior or API changes.	Add a new 'Version 0.2.1' section at the top of the release notes Describe restored compatibility with brainstate 0.5, saiunit/brainunit 0.5.1, and pytest 9.1 Summarize internal typing, convolution validation, and pytest parametrize-id adjustments that were done in a prior PR and validated for this release Record verification details (test suite, mypy, and build checks) for the release	changelog.md

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