Pure-Chez test gates (no Janet)

Add a Janet-free gate so correctness can be judged with only Chez + Clojure:
- host/chez/run-corpus.ss: corpus.edn vs JVM expecteds, lifting the per-case ns
  isolation from the old Janet driver; reads corpus.edn via the jolt reader.
- host/chez/run-unit.ss + test/chez/unit.edn: the host-specific unit cases,
  evaluated in-process and compared to baked expecteds.
- host/chez/selfcheck.sh: self-host fixpoint (bootstrap.ss rebuild == checked-in seed).
- host/chez/smoke.sh: real bin/joltc CLI smoke.
- host/chez/remint.sh: re-mint the seed to a byte-fixpoint after a source change.
- Makefile: 'make test' runs the lot; 'make remint' rebuilds the seed.

Numbers match the Janet gate: corpus 2679/2757 0 new div, unit 450/450, certify
0 new/0 stale.

jolt-cf1q.6

Makefile

@@ -0,0 +1,39 @@
+# jolt — Clojure on Chez Scheme. Single substrate, no Janet.
+#
+# bin/joltc runs jolt directly off the checked-in seed (host/chez/seed/); there is no
+# build step. `make test` is the full gate. `make remint` rebuilds the seed after a
+# source change.
+
+.PHONY: test corpus unit smoke selfhost certify remint
+
+# Full gate. Each step exits non-zero on failure, failing the target.
+test: selfhost corpus unit smoke certify
+	@echo "OK: all gates passed"
+
+# Self-host fixpoint: bootstrap.ss rebuild == checked-in seed.
+selfhost:
+	@sh host/chez/selfcheck.sh
+
+# Corpus conformance vs JVM-sourced expecteds (allowlist + floor).
+corpus:
+	@chez --script host/chez/run-corpus.ss
+
+# Host-specific unit cases.
+unit:
+	@chez --script host/chez/run-unit.ss
+
+# Real-CLI smoke over bin/joltc.
+smoke:
+	@sh host/chez/smoke.sh
+
+# JVM oracle: certify the corpus against reference Clojure. Skips if clojure absent.
+certify:
+	@if command -v clojure >/dev/null 2>&1; then \
+		clojure -M test/conformance/certify.clj; \
+	else \
+		echo "certify: clojure not on PATH — skipped"; \
+	fi
+
+# Re-mint the seed after changing a seed source (reader/analyzer/backend/core).
+remint:
+	@sh host/chez/remint.sh