v0.279.0: after_install (decision 45), known default logins on the page, Part D empty-backup alarm, night chain (R-705), R-706

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0159rPz1ZhFKsS53msqPYxtS

CONTEXT.md

@@ -7,7 +7,12 @@
 >
 > Ask Claude Code: "Please update CONTEXT.md with what we did today"
 
-Last updated: 2026-09-28 (v0.277.0 — kept data loads from the off-site copy too, R-691 (2))
+Last updated: 2026-09-28 evening (v0.279.0 — after_install / known default logins, Part D empty-backup alarm, night chain, R-706)
+
+> **2026-09-28 evening — v0.279.0.** `stacks/after_install.go` (decision 45: a fresh install replaces a known default
+> login; the deploy-done hook now set on every box), `web/known_login.go` (the page's default-login rule),
+> `backup/hollow_watch.go` (Part D: a running app's empty copy → digest + page), `web/night_chain.go` + `RunUpdateLegNow`
+> (R-705), `Router.removeVerificationCopy` (R-706). Also: v0.278.0 (R-704) earlier the same day.
 
 > **2026-09-28 — v0.277.0 (MinAgent 0.131.0).** `backup/kept_load.go`: `KeptBestCopy` (local newest vs off-site —
 > off-site only when NEWER or the only copy), `KeptOffsiteCopies` (ONE `snapshots --json`, 20 s bound; `offsiteNewest`