Polish run output: tilde paths, retro timing, dim cost, goal spacing

- Shorten paths with ~ instead of full home directory
- Show retro duration right-aligned like stage lines
- Add "Running retro..." indicator before retro agent runs
- Dim the Cost/Tokens summary line
- Add blank line after Goal before progress section

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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

@@ -584,6 +584,16 @@ pub fn format_tokens_human(tokens: i64) -> String {
     }
 }
 
+/// 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() {
+        if let Ok(suffix) = path.strip_prefix(&home) {
+            return format!("~/{}", suffix.display());
+        }
+    }
+    path.display().to_string()
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;

crates/arc-workflows/src/cli/progress.rs

@@ -59,7 +59,7 @@ fn red_cross() -> &'static str {
 
 // ── Duration formatting ─────────────────────────────────────────────────
 
-fn format_duration_short(d: Duration) -> String {
+pub(crate) fn format_duration_short(d: Duration) -> String {
     let secs = d.as_secs();
     if secs >= 60 {
         format!("{}m{:02}s", secs / 60, secs % 60)
@@ -311,7 +311,7 @@ impl ProgressUI {
     // ── Logs dir (called externally) ────────────────────────────────────
 
     pub fn show_logs_dir(&mut self, logs_dir: &Path) {
-        let path_str = logs_dir.display().to_string();
+        let path_str = super::tilde_path(logs_dir);
         match &self.renderer {
             ProgressRenderer::Tty(tty) => {
                 let bar = tty.multi.add(ProgressBar::new_spinner());

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

@@ -219,7 +219,7 @@ pub async fn run_command(
 
     let goal = graph.goal();
     if !goal.is_empty() {
-        eprintln!("{} {goal}", styles.bold.apply_to("Goal:"));
+        eprintln!("{} {goal}\n", styles.bold.apply_to("Goal:"));
     }
 
     print_diagnostics(&diagnostics, styles);
@@ -277,7 +277,7 @@ pub async fn run_command(
         eprintln!(
             "{} {}",
             styles.dim.apply_to("Logs:"),
-            styles.underline.apply_to(logs_dir.display()),
+            styles.underline.apply_to(super::tilde_path(&logs_dir)),
         );
     } else {
         progress_ui
@@ -708,12 +708,15 @@ pub async fn run_command(
     if total_tokens > 0 {
         if acc.has_pricing {
             eprintln!(
-                "Cost: {} ({} tokens)",
-                format_cost(acc.total_cost),
-                format_tokens_human(total_tokens)
+                "{}",
+                styles.dim.apply_to(format!(
+                    "Cost: {} ({} tokens)",
+                    format_cost(acc.total_cost),
+                    format_tokens_human(total_tokens)
+                ))
             );
         } else {
-            eprintln!("Tokens: {}", format_tokens_human(total_tokens));
+            eprintln!("{}", styles.dim.apply_to(format!("Tokens: {}", format_tokens_human(total_tokens))));
         }
         if acc.total_cache_read_tokens > 0 {
             eprintln!(
@@ -1217,6 +1220,8 @@ async fn generate_retro(
     }
 
     // Run retro agent session
+    eprintln!("{}", styles.dim.apply_to("Running retro..."));
+    let retro_start = std::time::Instant::now();
     let narrative_result = if dry_run_mode {
         Ok(crate::retro_agent::dry_run_narrative())
     } else if let Some(client) = llm_client {
@@ -1224,18 +1229,29 @@ async fn generate_retro(
     } else {
         Err(anyhow::anyhow!("No LLM client available"))
     };
+    let retro_dur = progress::format_duration_short(retro_start.elapsed());
 
     match narrative_result {
         Ok(narrative) => {
             retro.apply_narrative(narrative);
             match retro.save(logs_dir) {
                 Ok(()) => {
+                    let retro_path = format!(
+                        "{}/retro.json",
+                        super::tilde_path(logs_dir)
+                    );
+                    let msg = format!("Retro saved to {retro_path}");
+                    let term_width = console::Term::stderr()
+                        .size()
+                        .1 as usize;
+                    let dur_len = retro_dur.len();
+                    let pad = term_width.saturating_sub(msg.len() + dur_len);
                     eprintln!(
-                        "{} {}",
+                        "{} {}{:pad$}{}",
                         styles.dim.apply_to("Retro saved to"),
-                        styles
-                            .underline
-                            .apply_to(format!("{}/retro.json", logs_dir.display())),
+                        styles.underline.apply_to(&retro_path),
+                        "",
+                        styles.dim.apply_to(&retro_dur),
                     );
                 }
                 Err(e) => {