A read below the depth that filled the memo re-spells, so the depth guards still run

AGENTS.md

@@ -316,9 +316,12 @@ someone spells it or pins it.
 - The parse keeps each node's readable spelling in a memo, so the `commonMarkSpelling` ask spells a
   node once rather than once per level above it (18). The node reference is the key, which holds
   because the parse builds one object per position; `adfToMarkdown` passes no memo, where a
-  consumer's document may hold one node at two positions (4b). A kept spelling rebases: `text` and
-  `spelling` carry no depth, `headroom` is affine in it, and a reuse sits at or above the depth that
-  filled it. Only what succeeded is kept, so no path minted at another position is ever read.
+  consumer's document may hold one node at two positions (4b). `text` and `spelling` carry no depth
+  and `headroom` is affine in it, so a read above the depth that filled the entry rebases; a read
+  below re-spells, because a hit skips the depth guards the walk it replaces runs and an ordered
+  list past the marker cap gives way, spending two emitter levels where the parser spent one. A
+  give-way is kept too and serves any depth, reading the node's shape alone. Only what succeeded is
+  kept, so no path minted at another position is ever read.
 - No casts: `as`, `as unknown as`, non-null `!`. A boundary owes a type guard validating the
   fields it claims (`isAdfDocument`); past it everything is typed. Make invalid states
   unrepresentable.