Update README (phaseR: 620 trajectories; writer Claude Sonnet 5.5)

README.md

@@ -860,4 +860,4 @@ reads only the highest `phaseN/` folder of a task (its DAG with its own trajecto
   published under `phase2/` (not rewritten), the same task inputs, oracle rule, review rounds and validation. Each file's
   `provenance` says `engine: claude`, `model: claude-sonnet-5-5` and carries a `writer_note`.
 - Layout: `phaseR/<suite>/<task>/trajectories/<runId>.json`; the DAG stays `phase2/<suite>/<task>/task_dag.json`.
-- Status: 610 of 620 trajectories uploaded (267 tasks); the rest follow batch by batch.
+- Status: 620 of 620 trajectories uploaded (268 tasks) (complete).