Internal: Cherry pick [TMZ-1040]

[hein-obox]

✨ PR Description

1. Problem & Context

Cherry-pick from TMZ-1040 updating WordPress compatibility, refactoring linting infrastructure, and improving CI/CD test matrix configuration.

2. What Changed (Where)

• style.css: WordPress "Tested up to" bumped from 6.8 → 7.0
• composer.json: Renamed lint scripts from lint/lint:fix to lint:php/lint:php:fix
• package.json: Added comprehensive lint orchestration (CSS, JS, PHP) with individual fix commands
• .github/workflows/daily-test-matrix.yml: Replaced ternary operator with explicit bash conditional for RUN_TARGETED_TESTS
• .buildignore: Added .stylelintrc exclusion
• .stylelintrc: New config file with WordPress stylelint defaults, SCSS plugin, and standard ignores

3. How It Works

Unified linting interface: npm run lint chains CSS/JS/PHP checks; individual commands (lint:php, lint:css, lint:js) delegate to composer or wp-scripts. Workflow fix clarifies boolean logic by explicit if-block instead of ternary, improving readability and preventing edge-case evaluation bugs.

4. Risks

Minor: Bash conditional on line 103 assumes GitHub Actions context provides inputs.run_targeted_tests; malformed input could cause silent failures. Mitigation: test with missing/invalid inputs. CSS linting now active—may surface existing style violations in CI; stage enforcement gradually if needed.

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