fix(hermes): drop delta from reasoning extraction chain

Addresses Greptile review: `delta` is the field that carries streamed
assistant text in `message.delta` events, so keeping it in the
`reasoning.available` extraction chain risked silently treating a
non-reasoning `delta` payload as reasoning text. The remaining six field
names are semantically specific; ambiguous payloads now fall back to the
"Hermes reasoning available" placeholder, matching the stated safe-fallback
contract. Kept `.ts` and `.cjs` mirror in sync.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: harjothkhara

packages/adapters/hermes/gateway-ui-parser.cjs

@@ -35,8 +35,7 @@ function extractDirectReasoningText(data) {
     asString(data.thinking).trim() ||
     asString(data.text).trim() ||
     asString(data.summary).trim() ||
-    asString(data.content).trim() ||
-    asString(data.delta).trim()
+    asString(data.content).trim()
   );
 }
 

packages/adapters/hermes/src/gateway/ui/parse-stdout.ts

@@ -41,8 +41,7 @@ function extractDirectReasoningText(data: Record<string, unknown>): string {
     asString(data.thinking).trim() ||
     asString(data.text).trim() ||
     asString(data.summary).trim() ||
-    asString(data.content).trim() ||
-    asString(data.delta).trim()
+    asString(data.content).trim()
   );
 }