#494 datastore compact VACUUM fails with ERR_SQLITE_ERROR

Description

swamp datastore compact fails during the VACUUM step with:

WRN swamp·persistence·catalog VACUUM skipped: Error: too many attached databases - max 0

The WAL checkpoint succeeds, but the subsequent VACUUM operation is skipped entirely.

Steps to Reproduce

1. Have a repo configured with @swamp/s3-datastore
2. Run swamp datastore compact
3. Observe the VACUUM warning in output

Expected Behavior

VACUUM should complete successfully after WAL checkpoint, reclaiming space in the SQLite catalog.

Actual Behavior

VACUUM is skipped with ERR_SQLITE_ERROR — the error message references "too many attached databases - max 0", suggesting the SQLite connection has attached databases that prevent VACUUM, or the max_attached limit is set to 0 in the Deno compile environment.

Stack Trace

at CatalogStore.vacuum (catalog_store.ts:584:15)
at Object.vacuum (datastore_compact.ts:77:34)
at compact.ts:63:29

Environment

• swamp version: 20260530.005533.0-sha.1c117111
• Platform: macOS Darwin 24.6.0 (arm64)
• Datastore: @swamp/s3-datastore (S3 bucket: webframp-s3-swampdata, us-east-1)

Notes

The WAL checkpoint still reclaims some space, so this is not data-loss. But the full VACUUM (which rewrites the SQLite file to reclaim fragmented pages) never runs.