Add GitHub Action to run doctools.py on pull requests and commit data changes

[Copilot]

Independent contributors rely on local git hooks to run src/ssvc/doctools.py when src/ssvc/* changes. This adds a CI enforcement step so PRs always regenerate and commit updated data/ files before merging.

Changes

• .github/workflows/run_doctools.yml — new workflow that:
  • Triggers on PRs touching src/ssvc/**
  • Installs deps via uv, clears stale data/json/decision_points/, then runs python -m ssvc.doctools --overwrite --datadir ./data
  • Auto-commits any resulting data/ changes back to the PR branch with [skip ci] to prevent recursion; no-ops if nothing changed

Original prompt

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This section details on the original issue you should resolve

<issue_title>Create GitHub action to run doctools.py on pull requests</issue_title>
<issue_description>Independent contributors have local git hooks to run src/ssvc/doctools.py if code is changed in src/ssvc/*.

We want a GitHub action to run doctools.py on pull requests before merging, and then commit changes made in data/</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Create GitHub action to run doctools.py on pull requests #1069

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