fix(cloud): use worker-safe sqlite bundle chunks

[vincentkoc]

Summary

• cap cloud SQLite bundle parts at 64 MiB for Worker upload compatibility
• keep sqlite-only publishing and the gzip bundle manifest contract unchanged

Validation

• GOWORK=off go test ./internal/cli -run 'TestCloudPublishSendsNonDMRows|TestCloudPublishSQLiteOnlySkipsD1Ingest'\n- go run github.com/golangci/golangci-lint/v2/cmd/golangci-lint@v2.12.1 run ./internal/cli --timeout=3m

[clawsweeper]

ClawSweeper status: review started.

I am starting a fresh review of this pull request: fix(cloud): use worker-safe sqlite bundle chunks This is item 1/1 in the current shard. Shard 0/1.

This placeholder means the worker is alive and reading the current context. I will edit this same comment with the actual review when the claws are done clicking.

Crustacean status: shell secured, claws on keyboard, evidence pebbles being sorted.