fix(compile): show full error chain in batch compile output (#411)

When compiling all pipelines, errors were printed with Display format ({})
which only showed the outermost anyhow context ('Failed to parse YAML
front matter'). The underlying serde error with the specific unknown field
name was swallowed.

Switch to alternate Display format ({:#}) which prints the full error
chain, so users see the specific parse failure (e.g. 'unknown field
\safeoutputs\, expected one of \
ame\, \description\, ...').

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: jamesadevine

src/compile/mod.rs

@@ -243,7 +243,7 @@ pub async fn compile_all_pipelines(skip_integrity: bool, debug_pipeline: bool) -
             Ok(()) => success_count += 1,
             Err(e) => {
                 eprintln!(
-                    "  Error compiling '{}': {}",
+                    "  Error compiling '{}': {:#}",
                     pipeline.source, e
                 );
                 fail_count += 1;