Adopt reusable CI standard + PHPUnit suite (#8)

* feat(ci): adopt estate CI + add PHPUnit suite from scratch (v1.2.0)

- 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

* style: auto-fix PHPCS violations via phpcbf

* fix(ci): resolve latent PHPCS + JS lint failures

Latent debt surfaced by the reusable PHPCS job (previously continue-on-error).

PHPCS fixes (all pre-existing, not introduced by this PR):
- Add @package PeptideReconstitutionCalculator to file docblocks in all 12 PHP
  files (previously missing; phpcbf cannot insert missing docblock tags).
- Replace two short-ternary ?: operators in class-prc-preset-provider.php with
  full ternary (Universal.Operators.DisallowShortTernary.Found; lines 136+152).

JS lint fix:
- Add package.json + package-lock.json (no deps; lint script = node --check)
  so the reusable lint-js job's npm ci / cache: npm steps succeed. The
  calculator ships vanilla JS with no build toolchain — package.json is the
  minimal stub the reusable workflow requires for has_js: true.

Agent-Session: claude/adopt-ci-20260616

* style: auto-fix PHPCS violations via phpcbf

* fix(phpcs): suppress intentional warnings with phpcs:ignore annotations

uninstall.php: direct wpdb->query() intentional in uninstall (no caching
available); add phpcs:ignore DirectDatabaseQuery.DirectQuery and NoCaching.
class-prc-rest-controller.php get_presets(): request param required by
WP REST API callback contract; add phpcs:ignore UnusedFunctionParameter.

Agent-Session: claude/adopt-ci-20260616

---------

Co-authored-by: peptiderepo <bot@peptiderepo.com>
Co-authored-by: peptiderepo <peptiderepo@users.noreply.github.com>

peptide-reconstitution-calculator.php

@@ -3,7 +3,7 @@
  * Plugin Name: Peptide Reconstitution Calculator
  * Plugin URI:  https://peptiderepo.com/tools/reconstitution-calculator
  * Description: Interactive reconstitution calculator with peptide-specific presets from Peptide Repo Core. Computes concentration, injection volume, syringe units, and doses per vial.
- * Version:     1.0.0
+ * Version:     1.2.0
  * Author:      peptiderepo
  * Author URI:  https://peptiderepo.com
  * License:     GPL-2.0-or-later
@@ -15,6 +15,7 @@
  *
  * Depends on: Peptide Repo Core (optional — provides peptide-specific presets).
  * Without PR Core, the calculator still works with manual entry and built-in defaults.
+ * @package PeptideReconstitutionCalculator
  */
 
 declare(strict_types=1);
@@ -25,7 +26,7 @@ if ( ! defined( 'ABSPATH' ) ) {
 
 /* ── Constants ────────────────────────────────────────────────────────── */
 
-define( 'PRC_VERSION', '1.0.0' );
+define( 'PRC_VERSION', '1.2.0' );
 define( 'PRC_PLUGIN_FILE', __FILE__ );
 define( 'PRC_PLUGIN_DIR', plugin_dir_path( __FILE__ ) );
 define( 'PRC_PLUGIN_URL', plugin_dir_url( __FILE__ ) );
@@ -37,9 +38,9 @@ PRC_Autoloader::register();
 
 /* ── Activation / Deactivation ────────────────────────────────────────── */
 
-register_activation_hook( __FILE__, [ 'PRC_Activator', 'activate' ] );
-register_deactivation_hook( __FILE__, [ 'PRC_Deactivator', 'deactivate' ] );
+register_activation_hook( __FILE__, array( 'PRC_Activator', 'activate' ) );
+register_deactivation_hook( __FILE__, array( 'PRC_Deactivator', 'deactivate' ) );
 
 /* ── Boot ─────────────────────────────────────────────────────────────── */
 
-add_action( 'plugins_loaded', [ 'PRC_Calculator', 'boot' ] );
+add_action( 'plugins_loaded', array( 'PRC_Calculator', 'boot' ) );