Replace em dashes with hyphens across docs and comments

Cargo.toml

@@ -2,7 +2,7 @@
 name = "continuum-proxy"
 version = "0.1.0"
 edition = "2024"
-description = "Continuum edge gateway daemon — runs on-site, bridges printers to the cloud control plane"
+description = "Continuum edge gateway daemon - runs on-site, bridges printers to the cloud control plane"
 license = "UNLICENSED"
 
 [lib]
@@ -50,7 +50,7 @@ dotenvy = "0.15"
 
 # Real printer protocol clients (MQTT for Bambu, HTTP for PrusaLink/
 # Moonraker, FTPS for gcode transfer) go here once you're ready to build
-# past the stubs in src/printer/ — see that module's doc comment.
+# past the stubs in src/printer/ - see that module's doc comment.
 continuum-rust-types = { path = "../continuum-schemas/packages/rust-types" }
 # FOR NON-LOCAL DEV
 # continuum-rust-types = { git = "https://git.octoturge.com/Continuum/continuum-schemas.git" }