ci: fix PyPI publish action pin

[justin-layerv]

Summary

• correct the pinned pypa/gh-action-pypi-publish commit SHA used by Release Please
• add a manual Publish PyPI workflow so the already-created v0.2.0 release tag can be published after the failed release job

Business relevance

This restores the Python SDK release path and unblocks publishing layerv-qurl v0.2.0 to PyPI for customers/installers.

Validation

• git diff --check
• parsed workflow YAML locally
• verified corrected pypa/gh-action-pypi-publish commit exists via GitHub API
• earlier release branch validation: ruff check, mypy src/, pytest tests/ -v, python -m build

[claude]

Review: ci: fix PyPI publish action pin

Focused, sensible change. The diff does two things — corrects the bad pypa/gh-action-pypi-publish pin and adds a manual backfill workflow to publish the existing v0.2.0 tag. Overall looks good; a few things worth checking before relying on it.

⚠️ Main concern: PyPI Trusted Publishing is configured per workflow filename

The new publish-pypi.yml uses OIDC (id-token: write, environment: pypi, no API token). PyPI's trusted publisher entries are scoped to a specific workflow filename (and optionally environment). The existing publisher was almost certainly registered for release-please.yml. Unless you've added a matching trusted publisher (or a pending publisher) for publish-pypi.yml with the pypi environment on PyPI, the OIDC exchange will be rejected and this manual run will fail — the same class of failure you're trying to recover from.

Action: confirm a Trusted Publisher entry exists on PyPI for publish-pypi.yml before dispatching, or reuse the existing release-please.yml filename for the backfill.

Bugs / correctness

• SHA correctness (the core fix): I couldn't independently verify the new pin 76f52bc884231f62b9a034ebfe128415bbaabdfc resolves to the v1.12.4 tag (network/API access was blocked in my environment). Since the whole PR hinges on this, please double-check via gh api repos/pypa/gh-action-pypi-publish/git/refs/tags/v1.12.4 that it dereferences to this commit. Worth confirming what produced the original wrong SHA so it doesn't recur.
• Re-publish failure: if v0.2.0 artifacts already exist on PyPI, the publish step will hard-fail (file already exists). Expected for a one-shot backfill, just be aware re-runs aren't idempotent.

Security

• publish-pypi.yml builds and publishes from an arbitrary inputs.ref, so anyone with workflow_dispatch permission can publish any ref to PyPI. This is acceptable only if the pypi environment has protection rules (required reviewers / restricted branches). Recommend confirming that's in place.
• Permissions are correctly minimized (contents: read + id-token: write) and all actions are SHA-pinned with version comments. 👍

Maintainability (minor)

• This workflow reads as a one-time backfill but lives in the repo permanently. The default: v0.2.0 input will become stale/misleading for any future manual use. Consider either (a) removing it after the backfill, or (b) dropping the hardcoded default and renaming it to a generic "manual publish" tool.
• Unlike release-please.yml, the manual workflow skips the test matrix before publishing. Fine for re-publishing an already-tested tag, but note there's no guard if it's pointed at an untested ref later.

Test coverage

• N/A — CI-only change. The PR description's validation (git diff --check, YAML parse, API SHA check) is the right approach for a workflow change.

Nice clean fix — the trusted-publisher filename scoping is the one thing I'd verify before dispatching so the backfill doesn't fail the same way the original did.