Replace em dashes with hyphens across docs and comments

Cargo.toml

@@ -2,7 +2,7 @@
 name = "continuum-ai-worker"
 version = "0.1.0"
 edition = "2021"
-description = "Continuum AI worker — consumes camera frame batches from Redis Streams and runs print-failure detection"
+description = "Continuum AI worker - consumes camera frame batches from Redis Streams and runs print-failure detection"
 license = "UNLICENSED"
 
 [[bin]]
@@ -21,4 +21,4 @@ dotenvy = "0.15"
 
 # Real inference (ONNX Runtime via the `ort` crate) and the Postgres audit
 # write (via `sqlx`) go here once src/inference and src/reporter grow past
-# their stubs — see those modules' doc comments.
+# their stubs - see those modules' doc comments.