R-699: a unit that holds no data is never an update-precondition copy (found live on 9202)

A just-installed app's unit, captured by the status refresh before any backup, satisfied
the precondition on its manifest time; tandoor's PostgreSQL was converted with no backup
of its database. Listed still; never a copy on Tier 1 or Tier 2. Red-proof RP6.

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

CHANGELOG.md

@@ -1,4 +1,4 @@
-## v0.275.0 — a backup's data and its version travel together (R-696, `07` §6.6, D4 option A); R-695, R-691, R-694 (2026-09-26)
+## v0.275.0 — a backup's data and its version travel together (R-696, `07` §6.6, D4 option A); R-695, R-691, R-694, R-699 (2026-09-26)
 
 **MinAgent: 0.131.0** (unchanged). Needs hub v0.123.0 (unchanged). New strings: yes (hu + en, 5 keys). Evidence:
 `felhom.eu/documentation/audits/version-travel-2026-09-26/`.
@@ -33,7 +33,12 @@
   page no longer shows that value as "the first password set at install" and says to use the password valid at the
   backup — measured per app: six of seven catalog apps keep the login in their data (code-server is the exception,
   `loginAppliedEveryStart`).
-- Red-proofs (each seen failing, tree restored): `A5-redproofs/` RP1–RP5, `D2/`, `D3/`, `D4/`. Parity: one new
+- **R-699 (found live on 9202 during Part B):** a unit that is only a captured definition — a just-installed app's,
+  written by the status refresh before any backup — satisfied the update's precondition ("Tier 1 copy 2m0s old") and
+  tandoor's PostgreSQL was converted with no backup of its database. Such a unit stays listed (restorable as the
+  definition) but is never a precondition copy on Tier 1 or Tier 2 (`RestorePoint.DataProven`, `unitDataTime`); the
+  update then backs up first.
+- Red-proofs (each seen failing, tree restored): `A5-redproofs/` RP1–RP6, `D2/`, `D3/`, `D4/`. Parity: one new
   Hungarian fixture (`deploy_deployed_restored_login`); no existing fixture changed.
 
 ## v0.274.0 — kept data: a choice at reinstall, a list, a read-only view, a load (2026-09-25, `09` §3 decision 36); R-690, R-692