[IzumiSy]

Motivation

We want packages/core coverage to be measured per PR against the current main baseline, with the diff posted back to the PR and updated as new commits are pushed.

The baseline should live in GitHub Actions artifacts so merges to main refresh the reference data without introducing another storage system.

Design Decision

Use octocov with GitHub Actions artifacts

octocov already supports both posting/updating PR comments and storing/loading prior reports from GitHub Actions artifacts. Using that built-in flow keeps the implementation to one workflow and one .octocov.yml file instead of custom artifact lookup and comment management code.

Keep the scope limited to packages/core

The workflow only runs the @tailor-platform/app-shell coverage task and only triggers for packages/core or coverage-workflow changes. That keeps runtime and noise down while matching the current request.

Summary

• add a packages/core coverage script that emits LCOV for octocov
• add .octocov.yml to store main reports in artifacts and diff PR coverage against them
• add a GitHub Actions workflow that runs on both main pushes and PRs, updating a single managed coverage comment

[github-actions]

Code Metrics Report

Coverage	Test Execution Time
90.0%	1m57s

Code coverage of files in pull request scope (0.0%)

Files	Coverage
packages/core/package.json	0.0%

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Reported by octocov

[IzumiSy]

Just rebased the branch and fixed lockfile after approve.