Stamp verdict flips and failure reasons on health-check telemetry

[RhysSullivan]

The health span (executor.connection.health.check) records the verdict but not what it replaced, so flapping — a connection oscillating between healthy and degraded — is only visible by diffing consecutive spans per connection. It also collapses very different failures (a probe timeout, a refused token refresh, a failed tool sync) into one degraded label, with the cause only in free text that never reaches telemetry.

• Add executor.health.previous_status and executor.health.changed to the health span: the verdict this check replaced, read from the row before probing. A first-ever verdict stamps neither.
• Add an optional enumerable reason to HealthCheckResult (credential_missing, credential_refresh_rejected, probe_timeout, probe_failed, upstream_status, tool_sync_failed), populated at every non-healthy verdict production site (core credential fold, dead-grant verdict, tool-sync stamp, MCP / OpenAPI / GraphQL probes) and stamped as executor.health.reason. Free-text detail still never goes on a span.
• Carry a structural timedOut marker on McpToolDiscoveryError so a slow-but-alive server classifies as probe_timeout without string-matching the message.

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commit: 4ed2784