#1209 Clear factory's remaining lint violations and retire both deferral lists

[williamthorsen]

What

Fixes all lint violations in the factory project and restores the severity of all rules to "error" when a strict-lint check is run in that project.

Why

New violations of the deferred rules accumulated in factory and in the Catwalk demo without failing any check, and the root list reached every workspace, so the monorepo's strict-lint gate was weaker than it appeared. #1208 cleared factory's src/client/visualizations/ subtree; this covers the remainder.

Details

♻️ Refactoring

• Ten unicorn/prefer-await sites across App.tsx, useDismissedRuns.ts, project-watcher.ts, and settings-store.ts convert from promise chains to async/await, each invoked as void asyncFn() from the synchronous callback that owns it. Every converted function wraps its full body in try/catch, so no rejection can escape unhandled.
• useDismissedRuns gains a single module-level persistDismissed helper in place of the duplicate warn-and-swallow handlers in dismiss and dismissAll.
• ProjectWatcher extracts a private rescan(), taking its debounce-timer bookkeeping with it.

🧪 Tests

• The two useDismissedRuns persistence failure paths gain coverage, each asserting that the optimistic state survives a rejected patchSettings and that the warning fires.
• SettingsStore.save gains coverage for a failed rename, asserting that the original error propagates and the temp file is removed.
• useContainerResize.unit.test.ts moves to vi.stubGlobal/vi.unstubAllGlobals in place of a manual save-and-restore. vitest.setup.ts installs its ResizeObserver stub through an explicitly writable and configurable property descriptor, which is what lets a suite override the stub and restore it afterward.
• createDeferredPromise gives way to Promise.withResolvers.

⚙️ Tooling

• packages/factory/.config/ is deleted whole — both the deferral list and the package's strict-lint config — along with the tsconfig.json include entry that reached it. Ceilings merge from the repository root down, so factory keeps the root's advisory set and loses only its own five entries.
• The root .config/eslint/deferred-lint-rules.ts and the eslint.config.ts block that applied it are deleted; the root strict-lint config keeps advisoryRuleSeverities alone.
• Three suppressions survive, each scoped to the one file that needs it. The Symbol.dispose sites take eslint-disable directives, so reportUnusedDisableDirectives will flag them as unused once unicorn's Symbol allowlist admits the well-known symbol. demos/catwalk/scenarios.js takes an ESLint configuration comment instead, exempt from that check, leaving a frozen prototype uncoupled from future rule churn.

Closes #1209

[github-actions]

Dependency audit

Production dependency audit passed.