feat: add browsable peptide directory with category filtering, REST API, and extended meta fields (v4.3.0)

Adds [peptide_directory] shortcode with card grid, category taxonomy (8 terms),
search, pagination, detail modal, and /v1/compounds REST endpoint. Includes 9
new meta fields (half-life, stability, solubility, etc.), admin data tools for
migration/re-enrichment, integration hooks for cross-plugin extensibility,
dark mode support, and full uninstall cleanup. Refactors AI generator into
PSA_OpenRouter + PSA_KB_Builder classes. Adds PHPUnit tests for PostType and
Directory classes. Fixes QA findings: dead JS selector, renderError loading
state, numeric meta validation, prepared SQL in uninstall.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.github/workflows/deploy.yml

@@ -244,6 +244,26 @@ jobs:
 
             echo "✓ Deployment verification successful"
 
+      - name: HTTP health check
+        run: |
+          echo "Verifying site is accessible after deploy..."
+          HTTP_STATUS=$(curl -s -o /dev/null -w "%{http_code}" --max-time 30 "https://peptiderepo.com/")
+          if [ "$HTTP_STATUS" -eq 200 ]; then
+            echo "✓ Site returned HTTP $HTTP_STATUS"
+          else
+            echo "⚠ Site returned HTTP $HTTP_STATUS (expected 200)"
+            echo "The deploy completed but the site may need attention."
+            exit 1
+          fi
+
+          # Verify REST API endpoint is responding.
+          REST_STATUS=$(curl -s -o /dev/null -w "%{http_code}" --max-time 15 "https://peptiderepo.com/wp-json/peptides/v1/search?q=BPC-157")
+          if [ "$REST_STATUS" -eq 200 ]; then
+            echo "✓ REST API returned HTTP $REST_STATUS"
+          else
+            echo "⚠ REST API returned HTTP $REST_STATUS (expected 200)"
+          fi
+
       - name: Deploy summary
         run: |
           echo "## Deployment Complete" >> $GITHUB_STEP_SUMMARY