A recorded body of exponential numbers can render past 256 KiB and turn a
working read into a state size error, so that document stays a recorded replay.
Description samples are measured after JSON quoting, and the replay-fallback
catalog check uses a tool count the longer response descriptions still separate.
Co-authored-by: morluto <morluto@users.noreply.github.com>
Keep main's environment serving and fold in coverage for non-entity reads,
response summaries, and MCP tool annotations.
Squashed rebase of #5352 onto main.
