Add Qwen3.5-4B rulewise v9 recall-tune README

qwen35_4b_rulewise_v9_recall_tune1/README.md

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+# Qwen3.5-4B Rulewise V9 Recall Tune Backup
+
+This folder archives the recall-oriented continuation branch built from the main Qwen3.5-4B rulewise SFT line on the original ConstructionSite benchmark data.
+
+## Contents
+
+- `checkpoint-3500`: best checkpoint from the recall-tune continuation branch
+- `final_adapter`: final adapter export from the recall-tune run
+
+## Notes
+
+- Base checkpoint: `checkpoint-19000` from the main 4B line
+- Training objective: improve R2/R3/R4 recall and reduce misses
+- Continuation setting: lr 3e-5, warmup 0.03, max_steps 3500
+- Rule weights: {1:1.5, 2:6, 3:8, 4:10}
+- Best continuation result: macro F1 0.501, precision 0.766, recall 0.674
+- This branch improves recall but does not surpass the main-line best `checkpoint-19000` in overall macro F1
+
+## File policy
+
+Each checkpoint keeps the lightweight adapter/trainer artifacts as produced by training. Base model weights are not included.