ChatDelivery gains tuple index 11, `image: Option<ChatImage>` ([path, mime,
size, sha256], a reference into her per-room image store, never bytes); the
pending kind is gamecult.persona.chat_pending.v2, and v1 answers and records
still decode with no image. chat_image::load is the one place a reference
becomes bytes: exact `<hex sha256 of room id>/<sha256>[.ext]` path with no
traversal or symlink, regular file, 5 MiB declared and actual, declared size
and sha256, png/jpeg/gif/webp magic bytes matching the declared mime. The
persona line carries the image as a base64 image block after its text and an
`attachment role=organ` line saying attached or not shown and why. The
stream-json echo of a line with blocks still counts as our echo. The store is
MIND_PERSONA_IMAGE_STORE; unset, every image is not shown.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>