fix(19): satisfy CI fast-checks + secret scan

Lint (eslint --max-warnings 0):
- index.ts: disable no-unsafe-argument on the type-only Context mismatch when
  delegating to the OIDC handler inside the local-session skip wrapper
- localAuth.ts: handleLogout is sync (no await) — drop async (require-await)
- devBypass.ts: disable detect-possible-timing-attacks on the public well-known
  dev-placeholder string compare (not a secret comparison)
- remove dead code / unused bindings flagged by no-unused-vars: makeTestApp
  (localSession.test), makeUnauthContext + BrowserContext import (login.spec),
  unused memberId (admin.test), unused txSelectCount counter (me.test)
- localAuthMiddleware.test / me.test: fix unused + reflow-detached
  eslint-disable directives

Format: prettier --write across the 20 Phase-19 files that were never formatted.

Secret scan (gitleaks): allowlist two false positives — the synthetic >=32-char
TEST_SECRET in localSession.test.ts, and .planning/ design prose (a generic-api-key
regex hit on "credential atomically, 409-equivalent"). Neither is a real secret.

Verified locally: format:check, lint, typecheck, md:lint, gitleaks (no leaks),
PWA 266/266, API 452/452.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/api/src/index.ts

@@ -128,7 +128,10 @@ app.get('/callback', async (c) => {
         return c.redirect('/?error=oidc-link-conflict');
       }
       // Unexpected error during link binding — log and continue with normal redirect.
-      console.error('[callback] linkOidcToUser unexpected error:', err instanceof Error ? err.message : String(err));
+      console.error(
+        '[callback] linkOidcToUser unexpected error:',
+        err instanceof Error ? err.message : String(err),
+      );
     }
   }
 
@@ -193,6 +196,9 @@ if (!devBypassActive) {
       await next();
       return;
     }
+    // oidcHandler's parameter is typed as the generic Hono Context; our wrapper's c is the
+    // same runtime Context narrowed to '/api/*' — the structural mismatch is type-only.
+    // eslint-disable-next-line @typescript-eslint/no-unsafe-argument
     await oidcHandler(c, next);
   });
   // Re-issues the session-scoped oidc-auth cookie as persistent so PWA sessions survive close (AUTH-02).