ci: pull request workflows do not dispatch for ready PR #395

[castrojo]

What: Ready PR #395 changes .github/workflows/renovate-automerge.yml, .github/workflows/reusable-renovate-automerge.yml, and tests/validate_reusable_renovate_automerge.sh, matching the configured pull_request.paths in actionlint.yml and unit-tests.yml. No Actions runs or check rollups were dispatched after ready-for-review and a subsequent branch push.

Impact: CI-gated MergeRaptor auto-merge cannot receive required PR validation, blocking deployment of the repair.

Evidence: gh run list --repo projectbluefin/actions --branch fix/renovate-automerge-caller and PR check rollup are empty. Local validation passes: actionlint for both workflows and the guardrail simulation script.

Fix: Investigate repository/workflow event delivery and restore PR workflow dispatch.

Automatable: yes

Note: this repository has no existing kind/bug or area/ci labels to apply.

[castrojo]

Closing: created while over-scoping a Renovate inspection; no follow-up action requested.