Revalidate stale connection health verdicts automatically

[RhysSullivan]

Agents read a connection's persisted health verdict through connections.list, but nothing server-side ever re-checked it — only the web UI's mount probe and the manual Check now button. One transient probe failure left a sticky unhealthy verdict, and agents kept telling users to reconnect a connection that worked fine (invocation auto-refreshes OAuth tokens). Reported in shared-owner.

Two repair paths:

• The agent-facing connections.list re-runs the Check now probe before reporting a non-healthy verdict older than 60s (served cached inside the window via the existing ifStaleMs, so repeated lists collapse to one probe). Healthy verdicts are served as-is.
• A successful tool invocation flips a persisted non-healthy verdict back to healthy — real traffic is stronger evidence than any probe.

Deliberately untouched: tool-sync failure verdicts (only a successful sync clears them) and grants recorded invalid_grant-dead (reconnect genuinely required). PluginCtx.connections gains checkHealth to support the read path.

Tested: new unit coverage for both paths in connections.test.ts; e2e selfhost/mcp-oauth-reconnect-health and scenarios/health-checks-ui pass.

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