feat(ci): add version-bump workflow for Renovate PRs

[lawrence-u10d]

Summary

• Adds automated version bumping for Renovate dependency update PRs
• Uses the shared reusable workflow from Unstructured-IO/infra
• Automatically bumps version in pyproject.toml, updates CHANGELOG.md, and refreshes uv.lock

How it works

When Renovate opens or updates a PR, this workflow:

1. Detects which components were changed
2. Parses conventional commit messages to determine bump type (major/minor/patch)
3. Bumps the version, updates changelog, and commits back to the PR branch

🤖 Generated with Claude Code

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Note

Medium Risk
Medium risk because it introduces an automated workflow with contents: write that can push commits to PR branches; misconfiguration could cause unintended version/changelog updates.

Overview
Introduces a new version-bump GitHub Actions workflow that runs on pull_request events targeting main, but only when the PR author is utic-renovate[bot].

The job delegates to the reusable workflow in Unstructured-IO/infra, configured to default to a patch bump and to automatically update the changelog and lockfile, using repository secrets/vars for Renovate app credentials and a token with write access to contents.

^{Written by Cursor Bugbot for commit 541a644. This will update automatically on new commits. Configure here.}

[aballman]

Looks good — standard version-bump workflow rollout.