Preserve Claude ACP quota classification and reset time (#13651)

Typed Claude ACP quota failures lost their recovery classification and reset
time when the runtime reduced provider metadata to a generic category error.
Inspect terminal metadata in memory and retain only safe recovery labels and
a parsed reset timestamp. Preserve the existing handling of other limits.

Verified real child processes on both pinned ACPX runtimes, adapter and
server recovery regressions, all PR CI gates, and Greptile 5/5. Also isolate
a pre-existing chat regression from unrelated fixtures’ retry work.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

scripts/mcp-fixtures/servers/acp-echo-agent.mjs

@@ -41,7 +41,7 @@ async function handleRequest(request) {
       const sessionFailure = {
         id: `${request.params.sessionId}:error`,
         revision: 1,
-        category: "request",
+        category: process.env.PAPERCLIP_ACPX_TYPED_FAILURE_CATEGORY ?? "request",
         severity: "error",
         title: typedFailureCanary,
         actions: [],