fix(build): activated zune-jpeg log feature and widened test compat type

- zune-jpeg 0.5.15 (image 0.25's JPEG decoder) cannot compile with its
  non-default log feature off: zune-core's no-log warn! stub is not
  expression-safe. A feature-activation-only workspace dep on
  zune-jpeg { features = ["log"] } fixes the cold build; log stays 0.4.33.
- model-registry-default-config's local ModelSnapshot type gains the optional
  streamIdleTimeoutMs the Bedrock watchdog compat now emits.

crates/pi-natives/Cargo.toml

@@ -38,6 +38,8 @@ html-to-markdown-rs.workspace = true
 icy_sixel.workspace = true
 ignore.workspace = true
 image = { workspace = true, features = ["bmp"] }
+# Feature activation only (see workspace manifest): zune-jpeg needs `log` to compile.
+zune-jpeg.workspace = true
 inferno.workspace = true
 napi.workspace = true
 napi-derive.workspace = true