perf: release profile — opt-level=z, lto, strip, panic=abort (7.8→4.2 MB)

Cargo.toml

@@ -67,3 +67,10 @@ notify = { version = "7", features = ["serde"] }
 
 # Testing
 tempfile = "3"
+
+[profile.release]
+opt-level = "z"      # optimise for size
+lto = true           # cross-crate dead-code elimination
+codegen-units = 1    # single unit = better LTO
+strip = true         # strip symbols from final binary
+panic = "abort"      # drop unwinding machinery (~200 KB)