justfile(fix[start]): Drop redundant test pre-run

why: just start ran the suite twice on launch. The explicit
`just test` line and pytest-watcher's `now = true` both trigger a
run at startup, so the suite executed back-to-back before watching.

what:
- Remove the `just test` line from the start recipe; ptw's
  now=true already runs once on launch, then watches

Author: tony

justfile

@@ -20,7 +20,6 @@ test *args:
 # Run tests then start continuous testing with pytest-watcher
 [group: 'test']
 start:
-    just test
     uv run ptw .
 
 # Watch files and run tests on change (requires entr)