feat: dedup and format the output

config/config.yaml

@@ -52,9 +52,9 @@ outputs:
     params:
       webhook_env_var: DISCORD_WEBHOOK_URL
 
-# Optional: save each run's fetched data + full prompt + raw/parsed analysis
-# to disk (one timestamped subdirectory per run) — useful for debugging
-# prompt or parsing issues without reproducing a live run. Off by default.
+# Always on: saves each run's fetched data + full prompt + raw/parsed
+# analysis to disk (one timestamped subdirectory per run). This is both a
+# debugging aid and the source of the previous run's report.md, which the
+# prompt reads back to dedup each briefing against the last one.
 archive:
-  enabled: false
   dir: ~/.local/state/stonks/runs