Merge branch 'v2/main' into v2/fix/2067-proxy-undici

One conflict, in `clients/tui/__tests__/App.test.tsx`: both sides added an
`opts` capture to the test harness's `FakeClient` for different fields —
`defaultMetadata` on v2/main (#1910), `environment.fetch` here (#2067) — so the
resolution is the union of the two, keeping both rationales and both tests.

Everything else auto-merged. `npm run ci` passes on the result.

Signed-off-by: cliffhall <cliff@futurescale.com>

core/mcp/node/servers.ts

@@ -49,7 +49,7 @@ export function headersToServerSettings(
   return {
     headers: Object.entries(headers).map(([key, value]) => ({ key, value })),
     env: [],
-    metadata: [],
+    metadata: {},
     connectionTimeout: 0,
     requestTimeout: 0,
     taskTtl: DEFAULT_TASK_TTL_MS,