Implement install stages S3–S5: package, policy, and skills sync.

Attach/onboard sandbox from agents/hermes, additive OpenShell policy overlays, and nemohermes skill install for scaffold skills. No doctor/connect and no push.

Makefile

@@ -1,19 +1,25 @@
 # Salon_Assistant / Lumina — operator entrypoints
 # Approved structure: document targets only; do not invoke unimplemented scripts.
 
-.PHONY: help bootstrap install install-s0-s2 upgrade doctor verify sync-design
+.PHONY: help bootstrap install install-s0-s2 install-s3-s5 upgrade doctor verify sync-design \
+        install-s0b install-s1 install-s2 install-s3 install-s4 install-s5
 
 help:
 	@echo "Salon_Assistant (Lumina) — $(shell cat VERSION 2>/dev/null || echo 'unknown')"
 	@echo ""
 	@echo "Implemented targets:"
 	@echo "  make bootstrap    - host prereqs (Docker if missing) [S0b]"
-	@echo "  make install      - full install S0b–S2"
-	@echo "  make install-s0-s2 - install stages S0b through S2 (same as install)"
+	@echo "  make install      - full install S0b–S5"
+	@echo "  make install-s0-s2 - install stages S0b through S2"
+	@echo "  make install-s3-s5 - install stages S3 through S5 (stack, sandbox, policy, skills)"
 	@echo ""
 	@echo "Staged install:"
+	@echo "  make install-s0b  - S0b only: Docker bootstrap"
 	@echo "  make install-s1   - S1 only: repository environment (.env)"
 	@echo "  make install-s2   - S2 only: model + vision config + smoke"
+	@echo "  make install-s3   - S3 only: stack alignment (documentation)"
+	@echo "  make install-s4   - S4 only: sandbox verify/onboard"
+	@echo "  make install-s5   - S5 only: policy overlays + skills sync"
 	@echo ""
 	@echo "Not yet implemented (stubbed):"
 	@echo "  make upgrade      - product upgrade"
@@ -26,19 +32,39 @@ help:
 bootstrap:
 	@bash scripts/bootstrap.sh
 
-install install-s0-s2:
+install:
 	@bash scripts/install.sh
 
+install-s0-s2:
+	@bash scripts/install.sh --stage s0b
+	@bash scripts/install.sh --stage s1
+	@bash scripts/install.sh --stage s2
+
+install-s3-s5:
+	@bash scripts/install.sh --stage s3-s5
+
+install-s0b:
+	@bash scripts/install.sh --stage s0b
+
 install-s1:
 	@bash scripts/install.sh --stage s1
 
 install-s2:
 	@bash scripts/install.sh --stage s2
 
-# ── Stubbed targets (S3+ not yet implemented) ──────────────────────────────
+install-s3:
+	@bash scripts/install.sh --stage s3
+
+install-s4:
+	@bash scripts/install.sh --stage s4
+
+install-s5:
+	@bash scripts/install.sh --stage s5
+
+# ── Stubbed targets (S6+ not yet implemented) ──────────────────────────────
 
 upgrade doctor verify:
-	@echo "not implemented — S3+ stages pending" >&2; exit 1
+	@echo "not implemented — S6+ stages pending" >&2; exit 1
 
 sync-design:
 	@echo "Design SSOT:"