Operator anchor for the init-23 migration-baseline squash.

Marks the last commit before the prototype's accumulated 96-migration
history is squashed into a clean v2 baseline (init-23, pending
design). Operators upgrading from a deployment that ran the
prototype-or-rc-era migration set to the post-squash schema check
out this tag, run its migrate as the final step on the old schema,
then dump-and-restore into a fresh DB initialised by the squashed
v2 migrate. Pre-1.0 stance: this is a manual cutover, not an
automated migration.

The pg_trgm operator-bootstrap fix (commit 0a5e1f0) is included so
operators on managed Postgres can still bootstrap cleanly against
this snapshot before the squash lands.

Branch state at tag time: feature/v2-enterprise, 8 commits ahead of
origin. Chart and binary at 2.0.0-rc.7.