non-production: set up codecov in this repo

[dep]

non-production: set up codecov in this repo

• Issue Link:

Summary of Changes

• Pass secrets: inherit to the shared ruby-test-matrix workflow so CODECOV_TOKEN reaches the Codecov upload step.
• Move the existing SimpleCov config out of spec/spec_helper.rb into spec/simplecov_helper.rb, required before the gem code loads. Previously SimpleCov started after active_record/data_classification was already required, so lib files were not measured. On CI it emits coverage/lcov.info via simplecov-lcov; locally it uses the HTML formatter.
• Add repo-level codecov.yml with target: auto / 1% threshold for project and patch statuses, since measured coverage is at or below 80%.

Measured local coverage: 31.9% line coverage (9 examples, 0 failures on Ruby 3.2.1). Verified coverage/lcov.info is generated with GITHUB_ACTIONS=true.

No dependency changes needed: simplecov and simplecov-lcov were already in the Gemfile and Gemfile.lock, and /coverage/ was already gitignored.

[coveralls]

Coverage Report for CI Build 29343722369

Coverage decreased (-68.1%) to 31.9%

Details

• Coverage decreased (-68.1%) from the base build.
• Patch coverage: No coverable lines changed in this PR.
• No coverage regressions found.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

No coverage regressions found.

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Coverage Stats

Relevant Lines:	279
Covered Lines:	89
Line Coverage:	31.9%
Coverage Strength:	0.51 hits per line

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💛 - Coveralls

[Copilot]

Pull request overview

Sets up Codecov reporting for this gem by ensuring coverage is collected correctly during CI runs and by configuring Codecov’s status checks.

Changes:

• Start SimpleCov before the gem code loads by moving coverage setup into spec/simplecov_helper.rb.
• Emit coverage/lcov.info on GitHub Actions (and HTML locally) to support Codecov uploads.
• Configure Codecov status thresholds via codecov.yml, and pass secrets through the reusable CI workflow.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
spec/spec_helper.rb	Requires the new SimpleCov bootstrap before loading the gem under test.
spec/simplecov_helper.rb	Centralizes SimpleCov configuration and switches formatters based on CI vs local runs.
codecov.yml	Adds Codecov status configuration with low thresholds and target: auto.
.github/workflows/pipeline.yml	Updates the reusable workflow job to pass secrets through for Codecov uploads.

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[codecov]

Welcome to Codecov 🎉

Once you merge this PR into your default branch, you're all set! Codecov will compare coverage reports and display results in all future pull requests.

Thanks for integrating Codecov - We've got you covered ☂️