fix: remove stale raw field expectation from test

The 'raw' field was removed from timeline entries in commit e80989e
(Nov 28) to reduce payload sizes by 64-85%. This test was never updated
and has been broken since then. Remove the stale expectation to align
with the current implementation.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

packages/server/src/server/agent/providers/claude-agent.test.ts

@@ -721,7 +721,6 @@ describe("convertClaudeHistoryEntry", () => {
       {
         type: "user_message",
         text: "Run npm test",
-        raw: entry.message,
       },
     ]);
   });