chore(ci): prune stale helper scripts

[yordis]

• CI maintenance is easier when obsolete helper scripts are not left next to the active workflow entrypoints.

[cursor]

PR Summary

Low Risk
Low risk: this PR only removes unused CI helper scripts and documentation, with no runtime or business-logic changes.

Overview
Removes the legacy ci/README.md and three CI helper scripts (ap-build-linux.sh, ap-test-linux.sh, ap-setup-osx.sh) to prune obsolete build/test setup entrypoints and reduce CI maintenance surface.

^{Reviewed by Cursor Bugbot for commit 46b4962. Bugbot is set up for automated code reviews on this repo. Configure here.}

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: a4ece080-90c8-4012-b78a-6ef4a99b64bc

📥 Commits

Reviewing files that changed from the base of the PR and between d552b3e and 46b4962.

📒 Files selected for processing (4)

• ci/README.md
• ci/ap-build-linux.sh
• ci/ap-setup-osx.sh
• ci/ap-test-linux.sh

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch yordis/chore-prune-stale-ci-scripts

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