Annotate session init spans with catalog size counts - #1845
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Production MCP session Durable Objects OOM their isolates at wildly varying resident-session counts, and per-session memory footprint varies a lot by organization. Today nothing explains which sessions are heavy, since workerd exposes no
performance.memory.This adds one cheap span attribute,
mcp.session.integration_count, on theMcpSessionDO.initspan, alongside the existingmcp.isolate.*residency attributes, so heavy sessions can be attributed to what they hold instead of only counted.Instrumentation only. No behavior change.