fix(ci): #168 drop lighthouse:no-pwa preset (re-failed every main push)

.github/lighthouse/lighthouserc.json

@@ -27,7 +27,7 @@
       }
     },
     "assert": {
-      "preset": "lighthouse:no-pwa",
+      "// note": "No preset — this is a daily/push perf DASHBOARD, not a merge gate (the job commits scores to docs/lighthouse-scores.json and runs on schedule + push-to-main). The lighthouse:no-pwa preset ships error-level per-audit assertions (errors-in-console, valid-source-maps, legacy-javascript...) that would fail every main push on a healthy site — the exact 'red check everyone ignores' problem #168 fixed. Category scores are warn-level: regressions show in the logs without failing the job. A genuine collect failure (site unreachable) still fails loudly because the step is no longer continue-on-error.",
       "assertions": {
         "categories:performance": ["warn", { "minScore": 0.5 }],
         "categories:accessibility": ["warn", { "minScore": 0.8 }],

.gitignore

@@ -138,3 +138,4 @@ scripts/__tests__/fixtures/*
 # SpecKit wrapper (Docker-first) — tool + cache state, never commit
 .speckit-tools/
 .speckit-cache/
+.lighthouseci/