test: use quiet dot reporters and show output only for failing tests

Switch vitest packages (ai, agent, coding-agent) to the dot reporter
with silent: passed-only so passing tests stay quiet while failing
tests still print their console output and full diffs. Add the
github-actions reporter on CI for inline annotations. Switch the tui
node:test runner to the dot reporter as well.

packages/coding-agent/vitest.config.ts

@@ -12,6 +12,8 @@ export default defineConfig({
 		globals: true,
 		environment: "node",
 		testTimeout: 30000,
+		reporters: process.env.GITHUB_ACTIONS ? ["dot", "github-actions"] : ["dot"],
+		silent: "passed-only",
 		server: {
 			deps: {
 				external: [/@silvia-odwyer\/photon-node/],