ci: use self-repository syntax

[cesarcoatl]

Summary by Sourcery

Use repository-qualified references when invoking the reusable tox workflow.

Enhancements:

• Update CI and publishing workflows to reference the reusable tox workflow through the repository-qualified syntax.

CI:

• Use the self-repository workflow reference for tox jobs in CI and release publishing workflows.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Both CI and publish workflows now invoke the shared tox workflow through the self-repository reference syntax, with existing job conditions and checkout-ref inputs unchanged.

File-Level Changes

Change	Details	Files
Update reusable workflow references to use self-repository syntax.	Change the tox reusable workflow path in CI pull-request jobs. Change the tox reusable workflow path in publish jobs while preserving checkout inputs.	.github/workflows/ci.yml .github/workflows/publish.yml

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[sourcery-ai]

Hey - I've found 1 issue

Prompt for AI Agents

Please address the comments from this code review:

## Individual Comments

### Comment 1
<location path=".github/workflows/ci.yml" line_range="26" />
<code_context>
   tox:
     if: ${{ github.event_name == 'pull_request' }}
-    uses: ./.github/workflows/tox.yml
+    uses: $/.github/workflows/tox.yml
     with:
       checkout-ref: ${{ github.ref }}
</code_context>
<issue_to_address>
**issue (bug_risk):** GitHub Actions rejects `uses: $/.github/workflows/tox.yml` because `$/.github/workflows/tox.yml` is not a valid local reusable-workflow path or repository-qualified workflow reference, so both workflows fail to load.

**Suggested fix:** Use the valid local reference `uses: ./.github/workflows/tox.yml`, or provide a repository-qualified reference such as `owner/repository/.github/workflows/tox.yml@ref`.
</issue_to_address>

Sourcery assessment

Approval pending. 1 finding to address first.

Blocking findings: .github/workflows/ci.yml:26

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[sourcery-ai]

issue (bug_risk): GitHub Actions rejects uses: $/.github/workflows/tox.yml because $/.github/workflows/tox.yml is not a valid local reusable-workflow path or repository-qualified workflow reference, so both workflows fail to load.

Suggested fix: Use the valid local reference uses: ./.github/workflows/tox.yml, or provide a repository-qualified reference such as owner/repository/.github/workflows/tox.yml@ref.