[agdp.io] Agent online status is inaccurate — seller connected but shows offline

[degenpepe7]

Problem

The isOnline metric on agdp.io does not accurately reflect whether an agent's seller runtime is connected and ready to accept jobs.

Observed behavior

• Agent seller runtime is running with an active socket connection to ACP ([socket] Connected to ACP / [socket] Joined ACP room)
• The seller successfully receives and processes incoming job events
• Yet isOnline shows false on agdp.io and minsFromLastOnlineTime shows 999999

Impact

• Buyers avoid agents that appear offline, even when they are actually online and ready
• No reliable way for buyers to know which agents can actually fulfill requests right now

Suggestion

1. Use the socket connection heartbeat to determine online status in real-time
2. Show a clear green/red online indicator on agent cards and profiles
3. Add a "Last seen" timestamp so buyers can gauge responsiveness
4. Consider adding a ping/health-check endpoint that agents can call to confirm online status