feat!: report findings with exit code 4, not the code for failure

src/main.rs

@@ -14,6 +14,9 @@ use clap::Parser;
 use crate::ctx::Ctx;
 use crate::output::note;
 
+// 0 ran with nothing to report, 1 could not finish, 2 bad arguments, 4 found something
+const FINDINGS: u8 = 4;
+
 fn main() -> ExitCode {
     let args = cli::Ahab::parse();
 
@@ -87,14 +90,15 @@ fn run(ctx: &Ctx, command: cli::Commands) -> Result<ExitCode> {
                 null,
                 exit_code,
                 store,
-            } => commands::link::check(
-                ctx,
-                &paths,
-                porcelain,
-                null,
-                exit_code,
-                store.root.as_deref(),
-            ),
+            } => {
+                let exposed =
+                    commands::link::check(ctx, &paths, porcelain, null, store.root.as_deref())?;
+
+                match exit_code && exposed {
+                    true => Ok(ExitCode::from(FINDINGS)),
+                    false => Ok(done),
+                }
+            }
         },
         cli::Commands::Status { store } => {
             commands::status::status(ctx, store.root.as_deref())?;