fix(checkout): surface auto-login failures

[superdav42]

Summary

• Stop checkout before gateway handoff when wp_signon() fails during automatic post-signup login.
• Return a user-visible checkout_login_failed error that includes the upstream WordPress/plugin login failure message.
• Add regression coverage for the password-path auto-login failure case.

Verification

• php -l inc/checkout/class-checkout.php
• php -l tests/WP_Ultimo/Checkout/Checkout_Test.php
• vendor/bin/phpcs inc/checkout/class-checkout.php
• vendor/bin/phpunit --filter test_login_customer_after_checkout_with_password_returns_error_when_signon_fails

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aidevops.sh v3.20.43 plugin for OpenCode v1.16.2 with gpt-5.5 spent 1h 27m and 1,973,291 tokens on this with the user in an interactive session.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

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Run ID: c8d1821a-8638-420f-b7da-955052dad492

📥 Commits

Reviewing files that changed from the base of the PR and between 1d45e8b and be4b4a7.

📒 Files selected for processing (2)

• inc/checkout/class-checkout.php
• tests/WP_Ultimo/Checkout/Checkout_Test.php

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/auto-20260609-110524

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[github-actions]

🔨 Build Complete - Ready for Testing!

📦 Download Build Artifact (Recommended)

Download the zip build, upload to WordPress and test:

• Build: ultimate-multisite
• ⬇️ Download from GitHub Actions
• ⬇️ Download without Github Account (nightly.link)

🌐 Test in WordPress Playground (Very Experimental)

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Playground support for multisite is very limitied, hopefully it will get better in the future.

🚀 Launch in Playground

Login credentials: admin / password

[superdav42]

Summary

• Stop checkout before gateway handoff when wp_signon() fails during automatic post-signup login.
• Return a user-visible checkout_login_failed error that includes the upstream WordPress/plugin login failure message.
• Add regression coverage for the password-path auto-login failure case.

Verification

• php -l inc/checkout/class-checkout.php
• php -l tests/WP_Ultimo/Checkout/Checkout_Test.php
• vendor/bin/phpcs inc/checkout/class-checkout.php
• vendor/bin/phpunit --filter test_login_customer_after_checkout_with_password_returns_error_when_signon_fails

---

aidevops.sh v3.20.43 plugin for OpenCode v1.16.2 with gpt-5.5 spent 1h 27m and 1,973,291 tokens on this with the user in an interactive session.

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Merged via PR #1363 to main.
Merged by deterministic merge pass (pulse-wrapper.sh).