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- Add PHPUnit 9.6 test suite (WP stubs, tests: stubs) — 40 tests across 4 files: MathTest: 25 tests covering all PRC_Math public methods and calculate() orchestrator with real peptide scenarios (BPC-157/TB-500/Semaglutide/MK-677/ Ipamorelin) plus edge cases (zero water, negative inputs, floor rounding, rounding precision, mcg↔mg conversion). DefaultPresetsTest: 11 tests — all 8 expected slugs, required keys per preset (dataProvider), dose_unit validity, min<max range, source field, spot-checks. RestControllerTest: 7 tests — calculate() 200 + correct values (mcg+mg), get_presets() 200, get_preset() 200 for known slug / WP_Error for unknown. PresetProviderTest: 4 tests — fallback to defaults sans PR Core, slug key present, cache invalidation, idempotent invalidation. - Add phpunit.xml.dist + tests/bootstrap.php (WP function/class stubs). - Add composer test script: vendor/bin/phpunit --configuration phpunit.xml.dist. - Add phpunit/phpunit ^9.6 + yoast/phpunit-polyfills ^2.0 to require-dev. - Replace standalone ci.yml with thin caller to estate reusable workflow: uses: peptiderepo/peptide-e2e/.github/workflows/ci.yml@main with: tests: stubs, has_js: true permissions: contents: write (required for phpcbf commit-back) workflow_call (required for deploy.yml gate). - deploy.yml unchanged — already gates on ./ci.yml + uses shared deploy-app.yml. - Version bump 1.1.0 → 1.2.0. Agent-Session: claude/adopt-ci-20260616