Add Replit starter scaffold and bootstrap script for unit-circle-benchmark

unit-circle-benchmark/ZIP_SAFE_REPLIT_STARTER.md

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+# Zip-safe Replit starter
+
+This scaffold is now generated by a runnable script (tested in this environment):
+
+```bash
+bash unit-circle-benchmark/scripts/bootstrap_replit_starter.sh /path/to/target
+```
+
+If you omit the target path, it scaffolds the current directory:
+
+```bash
+bash unit-circle-benchmark/scripts/bootstrap_replit_starter.sh
+```
+
+## What it creates
+
+- `README.md`
+- `requirements.txt`
+- `pyproject.toml`
+- `.replit`
+- `src/{main,config,data,embed,transforms,benchmark,metrics,utils}.py`
+- `data/{corpus,queries,qrels}.jsonl`
+- `outputs/{runs,metrics,plots}/`
+- `notebooks/sanity_checks.ipynb`
+
+## Safety behavior
+
+- Refuses to scaffold into a non-empty target by default.
+- Use `FORCE=1` if you intentionally want to overwrite.
+
+## Verification commands (used)
+
+```bash
+tmpdir=$(mktemp -d)
+bash unit-circle-benchmark/scripts/bootstrap_replit_starter.sh "$tmpdir"
+cd "$tmpdir"
+python -m compileall src
+```