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refactor(integrator): remove managed-census-size aggregate counter and gate

The integrator-wide ManagedCensusSize reservation is superseded by the
shared vote pool (MaxVotes/SentVotes), which already gates managed-org
publishing at the integrator level. The two were never the same metric —
census size was a released, point-in-time capacity reservation while
SentVotes is the monotonic billing tally — but the vote pool is the limit
the team actually meters on, so the census reservation is redundant.

Removes:
- OrganizationCounters.ManagedCensusSize and AddOrganizationManagedCensusSize
- the census branch of ReserveManagedPublish (now process-only) and its
  ManagedPublishLimits/CanPublishForManagedOrg census args/returns
- the publish-time census reservation + rollbacks in process.go
- the census-counter decrement on managed-org teardown

The per-plan Organization.MaxCensus stays: it still bounds per-census
participant adds, per-process census size, and standalone member limits.
Migration 0012's seeded maxManagedCensusSize is left as pinned history
(already unused since #557 dropped it from db.IntegratorLimits).