Fix Codex MCP file path capture and conversation ID persistence

1. Add input field to file_change timeline items for patch_apply_end
   and threadItemToTimeline so file paths appear in both input/output

2. Fix conversation ID preservation on resume by always setting
   lockConversationId when sessionId exists, and falling back to
   sessionId if conversationId not in metadata

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

packages/server/src/server/agent/providers/codex-mcp-agent.ts

@@ -2395,7 +2395,14 @@ class CodexMcpAgentSession implements AgentSession {
         const parsed = SessionIdentifiersSchema.parse(metadata);
         if (parsed.conversationId) {
           this.conversationId = parsed.conversationId;
-          this.lockConversationId = true;
+        }
+      }
+      // Always lock conversation ID on resume to preserve the original
+      // Even if metadata didn't have conversationId, we'll use sessionId as fallback
+      if (this.sessionId) {
+        this.lockConversationId = true;
+        if (!this.conversationId) {
+          this.conversationId = this.sessionId;
         }
       }
       const history = this.sessionId ? SESSION_HISTORY.get(this.sessionId) : undefined;
@@ -3304,6 +3311,7 @@ class CodexMcpAgentSession implements AgentSession {
             callId,
             displayName: buildFileChangeSummary(summaryFiles),
             kind: "edit",
+            input: { files: summaryFiles },
             output,
           }),
         });
@@ -3529,6 +3537,7 @@ class CodexMcpAgentSession implements AgentSession {
         callId: item.callId,
         displayName: buildFileChangeSummary(summaryFiles),
         kind: "edit",
+        input: { files: summaryFiles },
         output: { files: changes },
       });
     }