feat: add issue_count to SimulationRun

[u9g]

SimulationRun carries no issue count, so the simulations runs list can only fill its "Issues detected" column by zstd-decompressing and unmarshalling summary_zstd once per row.

Adds SimulationRun.issue_count (optional int32, field 21), denormalised at summarize time. Optional rather than plain: absent and 0 mean different things — "never summarized" versus "summarized, found nothing" — and a List response can carry the count without carrying the summary blob.

Consumers

Both pin this commit and need it merged first:

• livekit/agents-private, branch jason/sim-list-metrics: writes the count when the summarize result lands, returns it on list and get
• livekit/web, branch jason/sim-list-issue-count: reads it on the runs list, falling back to decoding the summary blob for runs summarized before the field shipped

Note for review

The regenerated Go stubs also record protoc v5.28.2 where main had v7.35.1. That is a side effect of the local toolchain, not an intended change — worth regenerating with the version main uses before merging.

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Latest commit: 42648b9

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