fix: stop one My Team load draining the sidecar pool (COACH-PULSE-4H)
- fix(sidecar): size the batch body cap to what a batch actually carries
- fix(data): cap simultaneous single-query reads so one tab cannot own the pool
- Merge pull request #795 from tpromni/fix/data-query-batch-body-cap
Source: tpromni/coach-pulse-consumer-ui → dev