- stemedb_claims.rs: fix list/get/delete handlers using wrong scan key
- Was scanning subject_index_key ({subject}\x00S:) which stores a
single Vec<Hash> — scan_prefix finds nothing on a single key
- Fix: use assertion_prefix ({subject}\x00H:*) to scan all assertions
- GET /v1/claims was returning [] even after creating claims
- aphoria.toml: add [hosted] section pointing to local StemeDB (18180)
- Enables aphoria scan --persist to push observations to StemeDB
- scripts/validate.sh: use release binary if available for fast startup
- --no-build flag now actually skips all compilation (sub-3s startup)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>