fix(swarm): extract content from AgentResult.message instead of non-existent .content

[wangwangbobo]

Problem

The swarm tool silently drops ALL sub-agent output. The 'Individual Agent Contributions' section is always empty despite sub-agents producing output (visible in token counts).

Root Cause

The code checks hasattr(node_result.result, "content") but AgentResult has .message (a dict with a "content" key), not .content directly. The hasattr() check always returns False, so the entire extraction block is silently skipped.

Fix

• Check for .message attribute instead of .content
• Extract content blocks from .message.get("content", [])
• Applied to both individual contributions and final team result sections

Fixes #437

Changes

• 1 file changed, 4 insertions(+), 4 deletions(-)