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>

.github/workflows/ci.yml

@@ -1,71 +1,27 @@
+##
+# Thin CI caller — peptide-reconstitution-calculator
+#
+# Delegates all lint/test/file-size jobs to the estate reusable workflow.
+# Per estate standard: workflow_call is required so deploy.yml can gate on it.
+# See: peptiderepo/peptide-e2e/.github/workflows/ci.yml@main for job definitions.
+##
 name: CI
 
 on:
+  pull_request: {}
   push:
-    branches: [ main ]
-  pull_request:
-    branches: [ main ]
-  workflow_call:
+    branches: [main]
+  workflow_call: {}
 
+# Required: calling workflow must declare contents: write so the reusable
+# phpcs job can commit phpcbf auto-fixes back to the PR branch.
 permissions:
-  contents: read
+  contents: write
 
 jobs:
-  # ── PHP Syntax Check ─────────────────────────────────────────────
-  lint-php:
-    name: PHP Lint (${{ matrix.php }})
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        php: [ '8.1', '8.2', '8.3' ]
-    steps:
-      - uses: actions/checkout@v4
-
-      - name: Set up PHP ${{ matrix.php }}
-        uses: shivammathur/setup-php@v2
-        with:
-          php-version: ${{ matrix.php }}
-
-      - name: Syntax check all PHP files
-        run: find . -name "*.php" -not -path "./vendor/*" | xargs -n 1 php -l
-
-  # ── WordPress Coding Standards (PHP CodeSniffer) ──────────────────
-  lint-phpcs:
-    name: WordPress Coding Standards
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-
-      - name: Set up PHP
-        uses: shivammathur/setup-php@v2
-        with:
-          php-version: '8.1'
-
-      - name: Install Composer dependencies
-        run: composer install --no-interaction --prefer-dist --no-progress
-
-      - name: Run PHPCS
-        run: composer run lint
-        continue-on-error: true
-
-  # ── 300-line file check ──────────────────────────────────────────
-  file-size:
-    name: 300-line file check
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-      - name: Check no PHP file exceeds 300 lines
-        run: |
-          violations=0
-          while IFS= read -r file; do
-            lines=$(wc -l < "$file")
-            if [ "$lines" -gt 300 ]; then
-              echo "VIOLATION: $file ($lines lines)"
-              violations=$((violations + 1))
-            fi
-          done < <(find . -name "*.php" -not -path "./vendor/*" -not -path "./tests/*")
-          if [ "$violations" -gt 0 ]; then
-            echo "$violations file(s) exceed 300 lines"
-            exit 1
-          fi
-          echo "All PHP files are 300 lines or fewer."
+  ci:
+    uses: peptiderepo/peptide-e2e/.github/workflows/ci.yml@main
+    with:
+      tests: stubs
+      has_js: true
+    secrets: inherit