fix: save comparison HTML artifacts

skills/last30days/scripts/last30days.py

@@ -97,11 +97,13 @@ def save_output(
     save_dir: str,
     suffix: str = "",
     synthesis_md: str | None = None,
+    topic_override: str | None = None,
+    rendered_content: str | None = None,
 ) -> Path:
     from datetime import datetime
     path = Path(save_dir).expanduser().resolve()
     path.mkdir(parents=True, exist_ok=True)
-    slug = slugify(report.topic)
+    slug = slugify(topic_override or report.topic)
     extension = "json" if emit == "json" else "html" if emit == "html" else "md"
     raw_label = "raw-html" if emit == "html" else "raw"
     suffix_part = f"-{suffix}" if suffix else ""
@@ -110,7 +112,9 @@ def save_output(
         out_path = path / f"{slug}-{raw_label}{suffix_part}-{datetime.now().strftime('%Y-%m-%d')}.{extension}"
     # Markdown saves keep the complete debug artifact. JSON and HTML preserve
     # their requested wire format so file extensions match their content.
-    if emit in {"json", "html"}:
+    if rendered_content is not None:
+        content = rendered_content
+    elif emit in {"json", "html"}:
         content = emit_output(report, emit, synthesis_md=synthesis_md)
     else:
         content = render.render_full(report)
@@ -171,6 +175,10 @@ def emit_comparison_output(
     raise SystemExit(f"Unsupported emit mode: {emit}")
 
 
+def comparison_topic(entity_reports: list[tuple[str, schema.Report]]) -> str:
+    return " vs ".join(label for label, _ in entity_reports)
+
+
 def compute_save_path_display(save_dir: str, topic: str, suffix: str, emit: str) -> str:
     """Compute the user-friendly save path string that will be shown in the footer.
 
@@ -875,8 +883,13 @@ def main() -> int:
     fun_level = config.get("FUN_LEVEL", "medium").lower()
     footer_save_path = None
     if args.save_dir:
+        save_topic = (
+            comparison_topic(entity_reports)
+            if entity_reports and args.emit == "html"
+            else report.topic
+        )
         footer_save_path = compute_save_path_display(
-            args.save_dir, report.topic, args.save_suffix or "", args.emit
+            args.save_dir, save_topic, args.save_suffix or "", args.emit
         )
 
     # Signal to render_compact whether pre-research flags were supplied.
@@ -911,12 +924,19 @@ def main() -> int:
         )
     if args.save_dir:
         # Save the main topic's raw file (single-entity or comparison main).
+        save_topic = (
+            comparison_topic(entity_reports)
+            if entity_reports and args.emit == "html"
+            else None
+        )
         save_path = save_output(
             report,
             args.emit,
             args.save_dir,
             suffix=args.save_suffix or "",
             synthesis_md=synthesis_md,
+            topic_override=save_topic,
+            rendered_content=rendered if entity_reports and args.emit == "html" else None,
         )
         sys.stderr.write(f"[last30days] Saved output to {save_path}\n")
         # Competitor / vs-mode: also save a per-entity raw file for each peer.