trying to get sub label showed properly

CHEATSHEET.md

@@ -25,11 +25,24 @@ uv run bincio extract --since 2025-01-01        # only files newer than date
 uv run bincio extract --file ride.gpx           # single file → JSON on stdout
 uv run bincio extract --input ~/rides \
                       --output ~/bincio_data    # override config paths
+uv run bincio extract --dev 50                  # dev mode: 50 files → /tmp/bincio_dev/
 ```
 
 Re-extraction is safe — unchanged files are skipped (hash-based dedup).
 To force a full re-extract: `rm -rf ~/bincio_data && uv run bincio extract`
 
+### Dev mode
+
+`--dev N` samples N files evenly across the full file list (spread by date and format)
+and writes to `/tmp/bincio_dev/` so your real data is never touched. Use it for fast
+iteration on UI or pipeline changes:
+
+```bash
+uv run bincio extract --dev 50
+uv run bincio import strava --dev 50     # N most recent Strava activities
+uv run bincio render --serve --data-dir /tmp/bincio_dev
+```
+
 ---
 
 ## Import from Strava
@@ -54,6 +67,7 @@ uv run bincio import strava
 uv run bincio import strava --since 2025-01-01   # explicit date cutoff
 uv run bincio import strava --reauth             # force new OAuth flow
 uv run bincio import strava --output ~/other_dir # override output dir
+uv run bincio import strava --dev 50             # dev mode: 50 most recent → /tmp/bincio_dev/
 ```
 
 Credentials resolution order: