ci(changelog-review): extract as reusable workflow once shape is proven

[claude]

Context

From PR #1302 follow-up (not blocking):

Consider extracting the workflow into laurigates/.github as reusable-changelog-review.yml once the new shape is proven — per .claude/rules/ci-cd-workflows.md we prefer reusable workflows for cross-repo automation, though this one is plugin-collection specific so reuse value is currently low.

When to act

After the triage-only shape is validated across 2–3 stable weekly runs.

Design notes

• Target: laurigates/.github repo as reusable-changelog-review.yml
• Inputs would need to be parameterized: the tracking JSON path, label names, candidate rules file mapping
• The keyword→candidate-rules mapping is currently hardcoded to this repo's rule paths — that section would need to be either generic or accept a mapping input
• Reuse value is currently low (plugin-collection specific), so the trigger should be actual demand from a second repo needing the same automation

Acceptance criteria (if pursued)

• Reusable workflow lives in laurigates/.github
• Caller in this repo is a thin wrapper (uses: laurigates/.github/.github/workflows/reusable-changelog-review.yml@main)
• Keyword→candidate-rules mapping is parameterized or made repo-agnostic
• Existing weekly schedule and workflow_dispatch inputs are preserved

Related

• PR ci(changelog-review): refactor to triage-only + skip-if-exists #1302 (original triage-only refactor)
• .claude/rules/workflow-naming.md