fix(tag): no such tool available mcp__github_* (#556)

Signed-off-by: Kevin Cui <bh@bugs.cc>

# Conflicts:
#	src/mcp/install-mcp-server.ts
#	src/modes/tag/index.ts
#	test/modes/agent.test.ts

src/modes/agent/index.ts

@@ -135,8 +135,8 @@ export const agentMode: Mode = {
       baseBranch: baseBranch,
       claudeCommentId: undefined, // No tracking comment in agent mode
       allowedTools,
-      context,
       mode: "agent",
+      context,
     });
 
     // Build final claude_args with multiple --mcp-config flags