ci: per-spec e2e results in the run summary via Playwright json (refs #136)

tests/e2e/playwright.config.ts

@@ -21,7 +21,9 @@ export default defineConfig({
   // OOM-killed mid-action ("Page crashed") — fixing the flakiness at its source rather than leaning
   // on `retries` (CLAUDE.md §15). Only two long-running happy-path specs, so serial costs little.
   workers: 1,
-  reporter: [['list']],
+  // `list` for the live log; `json` (→ /e2e/playwright-report.json in the container) is copied out
+  // by run-e2e-check.sh and rendered as a per-spec table in the CI job summary (#136).
+  reporter: [['list'], ['json', { outputFile: 'playwright-report.json' }]],
   use: {
     baseURL,
     trace: 'on-first-retry',