chore: configure Codex and Copilot design tooling

.gitignore

@@ -24,3 +24,30 @@ dist-ssr
 *.njsproj
 *.sln
 *.sw?
+
+# Local browser audit output
+.playwright-cli/
+
+# Impeccable downloads a platform-specific engine on first use.
+# Keep the portable skill launchers in Git, but not the downloaded binary.
+.agents/skills/impeccable/scripts/bin/
+.github/skills/impeccable/scripts/bin/
+
+# Impeccable working state. Shared configuration and briefs remain tracked.
+**/.impeccable/config.local.json
+**/.impeccable/hook.cache.json
+**/.impeccable/hook.pending.json
+**/.impeccable/*.png
+**/.impeccable/review/
+**/.impeccable/questions/
+**/.impeccable/live/server.json
+**/.impeccable/live/sessions/
+**/.impeccable/live/previews/
+**/.impeccable/live/annotations/
+**/.impeccable/live/cache/
+**/.impeccable/live/manual-edit-apply-transaction.json
+**/.impeccable/live/manual-edit-events.jsonl
+**/.impeccable/live/manual-edit-evidence/
+**/.impeccable/live/pending-manual-edits.json
+**/.impeccable/live/deferred-svelte-component-accepts.json
+**/.impeccable/live/*.png