Skip comment template digest on writes

[HamptonMakes]

Why

Production comment writes intermittently take 400–900 ms because the synchronous broadcast computes a fragment template digest. Rails also misreads the partial's render once prose as a dependency on the nonexistent onces/once template.

What

• Skip the template digest while retaining record-versioned comment body caching
• Add an explicit cache namespace for intentional invalidation when Markdown rendering changes
• Reword the ERB comment so Rails cannot infer a bogus render dependency
• Add request coverage proving caching remains active without invoking the digestor

Risk Assessment

Low — comment HTML and broadcast behavior are unchanged. Existing cache entries are refreshed under the new namespace, and comment edits continue to invalidate via the record cache key.

References

• Digest-error requests: median 578 ms; maximum 909 ms
• Requests without the digest error: median 94 ms
• Full suite: 942 examples, 0 failures
• Datadog: https://square.datadoghq.com/logs?from_ts=1784053200000&live=false&query=service%3Acoplan-square+digesting&stream_sort=desc&to_ts=1784053860000

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