Add tag-release workflow for automated version tagging and GitHub Rel…

[ashwin31]

…ease creation

[Copilot]

Pull request overview

This PR updates the project’s release process to be fully automated: version bumps in pyproject.toml trigger an Action that creates the corresponding v<version> tag, publishes a GitHub Release (pre-release-aware), and then dispatches the existing PyPI publishing workflow against that tag.

Changes:

• Document the new “bump version only” release procedure and explain why workflow_dispatch is used to chain workflows safely.
• Add a new Tag release workflow that derives the tag from pyproject.toml, creates the GitHub Release, and triggers publish.yml.
• Update publish.yml to support workflow_dispatch and to fail loudly if run on a non-tag ref (while retaining the tag/version mismatch guard).

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
docs/contributing.md	Updates contributor release instructions to reflect automated tag+release creation and workflow_dispatch chaining rationale.
.github/workflows/tag-release.yml	Introduces a new workflow that derives v<version> from pyproject.toml, creates the tag + GitHub Release, then dispatches publish.yml on the tag.
.github/workflows/publish.yml	Adds workflow_dispatch as a supported trigger and adds an explicit “must be on tag ref” guard before publishing.

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