- Both term/comment filters now default to disabled for new installs, so
activating the plugin no longer reroutes or drops other plugins' meta
- One-time maybe_upgrade() migration keeps the misc bucket on for sites
that already hold misc rows and never set the toggle (data stays readable)
- Admin toggles show the same defaults as the filters
Verify: phpunit-integration --filter 'defaults_false|preserve_default';
unit 600 OK, integration 420 OK
PR: PR-006
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