Z: state the absent safety net -- no Guard region, so undeclared=0 is vacuous

findings/control-flow/tail-rng-ledger.md

@@ -308,6 +308,15 @@ by construction.
   moved the generator by 0 words on **16** observations (twice per turn, eight turns) and node-line decay by
   0 on **8**. That evidence is immune to both rules, because it does not ask which function drew — it asks
   whether the generator moved.
+* **No Guard region is declared by any hook in this family, so nothing here can report an undeclared
+  write.** That is deliberate — these hooks make no claim about game state at all, and a guard over the
+  generator would only duplicate the Result region that already covers the whole object — but it means the
+  usual harness-audit safety net is absent by design. Both traces show `err = 0`, `undeclared = 0` on 32
+  records each; the second number is vacuous and should be read that way.
+* **The one record with no ledger position is the first pre-turn autosave of each session**, which runs
+  before any turn driver and therefore before the hooks know the server pointer. It declares no region at
+  all rather than declaring one it cannot fill. Every record that *did* declare the region resolved: 0
+  `words: null` across 64 records.
 * **The ledger's block-chain machinery has never run live.** Every observation in both runs sat inside a
   single MT block — `left` walked 432 → 413 → 395 → 375 → 357 on `ref-turn2` and 263 → 243 → 223 → 201 → 181
   on the Zuul save, never reaching 0. So every live word count reduces to `left_before − left_after`, and the