knowledge: per-persona reviewed-only mode + agent reads include reviewed

Two coupled changes to the agent's recall surface:

1. Default scope expanded. recall_facts_for_photo and recall_entities
   used to filter to status='active' only — which silently dropped
   'reviewed' (human-verified) facts. Now they surface active +
   reviewed by default. Reviewed is strictly more trusted than
   active and shouldn't have been hidden. Rejected and superseded
   stay filtered.

2. New persona toggle `reviewed_only_facts` (BOOLEAN, default false,
   migration 2026-05-10-000400). When set, the agent's recall on
   that persona returns ONLY facts with status='reviewed' — strict
   mode for tasks where hallucinated agent claims are particularly
   costly. Wired:
   - schema.rs / Persona / InsertPersona / PersonaPatch grow the
     field.
   - PersonaView returns it as `reviewedOnlyFacts` (camelCase wire).
   - PUT /personas/{id} accepts it (mobile editor surfaces it).
   - InsightGenerator now carries a PersonaDao reference so
     recall_facts_for_photo can read the active persona's flag at
     start; one extra read per recall, cheap.

Composes with include_all_memories: that operates on the persona
*scope* axis (single vs hive), reviewed_only_facts on the *status*
axis. They're orthogonal.

Legacy persona rows pick up the default false on migration; no
behavior change unless explicitly toggled. The 4 existing persona
construction sites (one production, two tests, one InsertPersona in
knowledge_dao tests) all default the field. populate_knowledge bin
+ state.rs constructors also wire the new persona_dao arg.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

migrations/2026-05-10-000400_personas_reviewed_only/down.sql

@@ -0,0 +1 @@
+ALTER TABLE personas DROP COLUMN reviewed_only_facts;