chore(just): add run_signed script

Justfile

@@ -2,6 +2,7 @@ import "./just/build.just"
 import "./just/changelog.just"
 import "./just/code_check.just"
 import "./just/publish.just"
+import "./just/run.just"
 import "./just/site.just"
 import "./just/test.just"
 

just/run.just

@@ -0,0 +1,13 @@
+[group('run')]
+run *args:
+    @set -m; cargo run --bin termscp -- {{ args }}
+
+# Build, sign, and run the macOS CLI binary with a stable development identity
+# Job control gives smista its own foreground process group, so Ctrl-C reaches it
+# without also interrupting just.
+[group('run')]
+run_signed *args:
+    @test "$(uname -s)" = "Darwin" || (echo "run_signed is only supported on macOS." >&2; exit 1)
+    cargo build --bin termscp
+    codesign --force --sign "${TERMSCP_CODESIGN_IDENTITY:-Apple Development}" target/debug/termscp
+    @set -m; target/debug/termscp {{ args }}