diff --git a/.custodian-brief.md b/.custodian-brief.md
index b5c9c93..b4a777a 100644
--- a/.custodian-brief.md
+++ b/.custodian-brief.md
@@ -1,12 +1,15 @@
 <!-- custodian-brief: generated by fix-consistency — do not edit manually -->
 # Custodian Brief — the-custodian
 
-**Domain:** custodian  
+**Domain:** railiance  
 **Last synced:** 2026-03-27 00:05 UTC  
 **State Hub:** http://127.0.0.1:8000 *(adjust if running on a remote machine)*
 
 ## Active Workstreams
 
+### Cross-Repo E2E Sandbox Framework
+Progress: 7/7 done  |  workstream_id: `b68de20b-e397-4f97-b1be-ad30711fc2a6`
+
 ### FOS Hub Bootstrap — Identity, Hub Extraction, Ops Hub, Fin Hub
 Progress: 0/26 done  |  workstream_id: `293a74fe-a85a-4ad6-8933-23d52a72fe8b`
 
@@ -61,6 +64,6 @@ Progress: 0/9 done  |  workstream_id: `9cc32158-2f5c-4ef6-9713-aacce4623d5e`
 ## MCP Orientation (when available)
 
 If the state-hub MCP server is reachable, call:
-`get_domain_summary("custodian")`
+`get_domain_summary("railiance")`
 This provides richer cross-domain context.
 If the MCP call fails, use this file as your orientation source.
diff --git a/Makefile b/Makefile
index aeb0d3f..97ca4c5 100644
--- a/Makefile
+++ b/Makefile
@@ -44,6 +44,41 @@ else
   E2E_WS_FLAG :=
 endif
 
+## Install e2e cron job on railiance01 for a repo.
+## Usage: make e2e-cron-install REPO=activity-core
+## Requires: RAILIANCE01_HOST / RAILIANCE01_USER set, or pass HOST= SSHUSER=
+## The cron runs e2e/run-on-host.sh weekly (Sunday 03:13) on railiance01.
+## Idempotent: safe to re-run (replaces existing entry for the same repo).
+
+RAILIANCE_HOST  := $(or $(HOST),$(RAILIANCE01_HOST),92.205.62.239)
+RAILIANCE_USER  := $(or $(SSHUSER),$(RAILIANCE01_USER),tegwick)
+RAILIANCE_SSH   := ssh -o StrictHostKeyChecking=no $(RAILIANCE_USER)@$(RAILIANCE_HOST)
+
+.PHONY: e2e-cron-install
+e2e-cron-install:
+	@test -n "$(REPO)" || (echo "ERROR: REPO is required."; exit 1)
+	$(eval REMOTE_REPO := /home/$(RAILIANCE_USER)/$(REPO))
+	$(eval CRON_CMD := $(REMOTE_REPO)/e2e/run-on-host.sh >> /var/log/$(REPO)-e2e.log 2>&1)
+	$(eval CRON_LINE := 13 3 * * 0 $(CRON_CMD))
+	@echo "Installing cron on $(RAILIANCE_USER)@$(RAILIANCE_HOST) for $(REPO)..."
+	@$(RAILIANCE_SSH) "chmod +x $(REMOTE_REPO)/e2e/run-on-host.sh && \
+		( crontab -l 2>/dev/null | grep -v '$(REPO)-e2e' ; echo '$(CRON_LINE)' ) | crontab - && \
+		echo 'Cron installed:' && crontab -l | grep '$(REPO)-e2e'"
+
+## Remove e2e cron job from railiance01 for a repo.
+## Usage: make e2e-cron-remove REPO=activity-core
+
+.PHONY: e2e-cron-remove
+e2e-cron-remove:
+	@test -n "$(REPO)" || (echo "ERROR: REPO is required."; exit 1)
+	@$(RAILIANCE_SSH) "( crontab -l 2>/dev/null | grep -v '$(REPO)-e2e' ) | crontab - && echo 'Cron entry removed'"
+
+## List e2e cron jobs on railiance01.
+
+.PHONY: e2e-cron-list
+e2e-cron-list:
+	@$(RAILIANCE_SSH) "crontab -l 2>/dev/null | grep 'e2e' || echo '(no e2e cron entries)'"
+
 .PHONY: e2e
 e2e:
 	@test -n "$(REPO)" || (echo "ERROR: REPO is required. Usage: make e2e REPO=activity-core"; exit 1)