test: verify Copier template lifecycle

[mjun0812]

Overview and Background

Add a dedicated CI job that validates the generated project's full Copier lifecycle. The existing matrix verifies a fresh copy and its development checks, but it did not prove that a project produced by an older template revision can update to the current revision or that the resulting package builds.

Related Issues

None.

Implementation Approach

Generate the fixture from the immutable v1.0.0 tag, commit it as a Git repository as required by Copier updates, then update it using the current HEAD. The job asserts both a generated diff and a changed recorded template revision before building the package. This uses the actual historical-to-current Copier path instead of duplicating the fresh-copy matrix.

Changes

• Add an isolated Template lifecycle CI job with complete Git history so the historical tag is available.
• Update the historical generated project with Copier and fail if the update makes no changes or leaves the old revision recorded.
• Build the updated package and verify both sdist and wheel artifacts.
• Deduplicate shared Action-version matches before comparing them with the generated-project workflow.

Impact

CI gains one lifecycle job. Generated project contents, template behavior, compatibility, security, and deployment behavior are unchanged.

Validation Results

actionlint .github/workflows/test.yml

Passed.

uvx copier copy --vcs-ref v1.0.0 ./ /private/tmp/project --defaults \
-d project_name=lifecycle-project -d python_version=3.13 \
-d package_name=lifecycle_package -d description="Lifecycle test" \
-d author_name="Lifecycle Tester" -d author_email=lifecycle@example.com
git -C /private/tmp/project init
git -C /private/tmp/project add .
git -C /private/tmp/project commit -m "chore: initialize generated project"
uvx copier update --vcs-ref HEAD --defaults /private/tmp/project
uv build --directory /private/tmp/project

Passed: Copier updated the project from v1.0.0 to the current revision, produced a non-empty project diff, and built lifecycle_project-0.0.1.tar.gz plus lifecycle_project-0.0.1-py3-none-any.whl.

[mjun0812]

Codex PR Review

Summary

This pull request adds CI coverage for updating a project generated from v1.0.0 to the current template and building its distributions. No blocking findings were confirmed. The Contract axis was skipped because no spec source was available.

Verdict

APPROVE

Findings

N/A

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Reviewed by Codex at 42177d8