fix: address 2025-11-25 conformance audit findings (#951)

* fix: interpret task ttl as milliseconds

* fix: use text/plain for default text mime type

* fix: include resource param in token refresh

* test: align conformance prompt args with runner

* ci: run server conformance suite on PRs

* ci: build client bin and gate pending scenarios

crates/rmcp/src/model/resource.rs

@@ -193,7 +193,7 @@ impl ResourceContents {
     pub fn text(text: impl Into<String>, uri: impl Into<String>) -> Self {
         Self::TextResourceContents {
             uri: uri.into(),
-            mime_type: Some("text".into()),
+            mime_type: Some("text/plain".into()),
             text: text.into(),
             meta: None,
         }