Charlie Marsh a8bca62978
Reduce remote plugin catalog cache probing overhead ( #57258 ) ...
## Why
Cache presence and freshness checks deserialize full plugin records even when callers only need to decide whether a cached catalog is available.
## What changed
- Probe cache availability without deserializing plugin records, while still requiring a valid catalog envelope and a `plugins` array.
- Let `PreferFreshCache` reject stale catalogs from a 256-byte prefix when the header provides enough information; fall back to a full read otherwise.
- Limit discovery cache probes to the user and workspace scopes that need them, skipping the global cache probe.
- Serialize cached plugin slices directly without cloning them.
## Testing
Add coverage for malformed cache headers and payloads, reordered fields, stale-prefix rejection, and deferring plugin-record validation until a full catalog load.
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Charlie Marsh
a8bca62978