Open bundle update PRs from policyengine-release dispatch

[anth-volk]

Summary

Converts the PolicyEngine bundle update automation from pull-based (30-minute PyPI polling cron) to push-based: policyengine.py's release pipeline now sends a policyengine-release repository dispatch after each PyPI release (companion PR in PolicyEngine/policyengine.py), and this workflow opens the bump PR immediately.

Changes

• update-policyengine-bundle.yaml: replace schedule with repository_dispatch (policyengine-release); keep workflow_dispatch with an optional version input as the manual fallback; add a per-version concurrency group so duplicate dispatches serialize.
• update-policyengine-package.sh:
  • Feed the dispatched version in via LATEST_OVERRIDE.
  • Skip versions not strictly newer than the current pin (FORCE=1 overrides), preventing downgrade PRs from stale dispatches.
  • If the auto/update-policyengine-bundle-<version> branch exists without an open PR (previously a permanent wedge when gh pr create failed after push), create the PR from the existing branch.
  • Retry uv lock up to 3 times to absorb PyPI Simple-index propagation lag.

Behavior guarantees

• One single-version PR per release, on its own per-version branch — releases never stack as commits onto an existing PR.
• Older update PRs are never auto-closed or superseded.

Rollout

The dispatch trigger is inert until the policyengine.py companion PR merges. In the interim, trigger manually with gh workflow run and the version input.

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🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.72%. Comparing base (d05e429) to head (446d995).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3724   +/-   ##
=======================================
  Coverage   79.72%   79.72%           
=======================================
  Files          70       70           
  Lines        4326     4326           
  Branches      807      807           
=======================================
  Hits         3449     3449           
  Misses        657      657           
  Partials      220      220           

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