fix: create wisps tables on gt Dolt server, not just bd's instance

Two separate Dolt processes serve different data: bd's Dolt (per-rig
ports) has issues/wisps/labels tables, while gt's Dolt (port 3307) had
empty databases. migrate-wisps created tables via bd sql (bd's server)
but the reaper queries gt's server, causing "table not found" errors.

Now additionally creates wisps tables directly on the gt Dolt server
via MySQL protocol. Reaper gracefully handles missing issues/labels/
dependencies tables by skipping mail purge and stale issue checks.

Fix-merged from PR #2529 with: deduplicated DDL constants (ensureWispsTable
and ensureWispAuxTables now use shared wispsCreateDDL/wispAuxTableDDLs
vars instead of duplicating the schema), and replaced unsafe fmt.Sprintf
table existence check with parameterized information_schema query.

Co-Authored-By: DoxxedDoxie <[email protected]>
Co-Authored-By: Claude Opus 4.6 <[email protected]>

Author: 3 people