adapters install rustls ring provider before reqwest client; tui keyring deps to workspace; doc fixes

crates/adapters/poster-fetcher/tests/client_tls.rs

@@ -0,0 +1,8 @@
+//! Fresh test binary, no bootstrap: constructing the client must not panic
+//! for lack of a rustls CryptoProvider.
+use poster_fetcher::{PosterFetcherConfig, ReqwestPosterFetcher};
+
+#[test]
+fn poster_fetcher_builds_without_bootstrap() {
+    ReqwestPosterFetcher::new(PosterFetcherConfig { timeout_seconds: 5 }).expect("client builds");
+}