Print resolved graph path in arc run and arc validate

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

lib/crates/arc-workflows/src/cli/mod.rs

@@ -250,6 +250,16 @@ pub fn format_tokens_human(tokens: i64) -> String {
     }
 }
 
+/// Produce a relative path from cwd; falls back to `tilde_path` if not under cwd.
+pub fn relative_path(path: &Path) -> String {
+    if let Ok(cwd) = std::env::current_dir() {
+        if let Ok(rel) = path.strip_prefix(&cwd) {
+            return rel.display().to_string();
+        }
+    }
+    tilde_path(path)
+}
+
 /// Shorten an absolute path by replacing the home directory prefix with `~`.
 pub fn tilde_path(path: &Path) -> String {
     if let Some(home) = dirs::home_dir() {

lib/crates/arc-workflows/src/cli/run.rs

@@ -10,7 +10,7 @@ use arc_util::terminal::Styles;
 use chrono::{Local, Utc};
 use tracing::debug;
 
-use super::tilde_path;
+use super::{relative_path, tilde_path};
 use crate::checkpoint::Checkpoint;
 use crate::engine::{RunConfig, WorkflowRunEngine};
 use crate::event::EventEmitter;
@@ -359,6 +359,11 @@ pub async fn run_command(
             graph.edges.len()
         )),
     );
+    eprintln!(
+        "{} {}",
+        styles.dim.apply_to("Graph:"),
+        styles.dim.apply_to(relative_path(&dot_path)),
+    );
 
     let goal = graph.goal();
     if !goal.is_empty() {

lib/crates/arc-workflows/src/cli/validate.rs

@@ -4,7 +4,7 @@ use arc_util::terminal::Styles;
 use crate::validation::Severity;
 use crate::workflow::prepare_from_file;
 
-use super::{print_diagnostics, ValidateArgs};
+use super::{print_diagnostics, relative_path, ValidateArgs};
 
 /// Parse and validate a workflow file without executing it.
 ///
@@ -22,6 +22,11 @@ pub fn validate_command(args: &ValidateArgs, styles: &Styles) -> anyhow::Result<
         graph.nodes.len(),
         graph.edges.len(),
     );
+    eprintln!(
+        "{} {}",
+        styles.dim.apply_to("Graph:"),
+        styles.dim.apply_to(relative_path(&dot_path)),
+    );
 
     print_diagnostics(&diagnostics, styles);