[m-messer]

Stacked on the criteria and process graph images PR (base docs/criteria-graph-images).

Summary

Adds .github/workflows/doc-graphs.yml. On pull requests that change app/**, either generator script or the workflow itself, it installs graphviz and Node, runs scripts.generate_criteria_graphs and scripts.generate_process_graphs, and pushes a "Regenerate the documentation graphs" commit to the pull request's branch if any SVG changed.

Notes

• The first run will likely commit every SVG: the graphviz and mermaid versions on Ubuntu differ from Homebrew's, so the output differs slightly. Later runs only commit when the graphs change.
• Commits pushed with GITHUB_TOKEN don't trigger other workflows, so Test and Lint doesn't re-run on the bot's commit (and the workflow can't trigger itself). The main ruleset doesn't require status checks, so merging isn't blocked.
• Pull requests from forks are skipped, since the workflow can't push to them.
• A newer push to the same branch cancels a run in progress.
• Regenerating on production deploys instead isn't possible: the main ruleset requires a pull request with no bypass, and the shared deploy workflow builds the commit the run started from.

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