Deeper wrapper stacks still fit the current model when stripping prefixes exposes proved inner geometry

What happened

After quote + list wrapper stacks were green, the next honest question was:

• does one more wrapper layer break the model?

The test case was:

• outer quote
• list-item wrapper unit
• inner quote
• richer-inline paragraphs

What fixed it

It did not need a new transform.

The current model still held because stripping the wrapper prefixes still exposed the same already-proved inner geometry:

• recursive text-leaf ordering inside each block
• stable wrapper-unit sibling ordering

That meant the existing fragment, selection, and range-ref machinery was still good enough, and the browser proof confirmed it.

Why this works

The decisive question is not “how many wrappers exist?”

It is:

• after stripping wrapper prefixes, do we still land in a geometry the system already knows how to reason about?

If yes, the stack is deeper, but not conceptually new.

Reusable rule

For wrapper-stack growth:

• do not count wrappers
• inspect the inner geometry revealed after prefix stripping

If that inner geometry is still one of the already-proved shapes, prove the stack in the browser and keep the current model.

If not, that is the real next architecture seam.

Related issues

• 2026-04-05-nested-wrapper-stacks-can-be-promoted-once-browser-proof-matches-the-contract-layer.md
• 2026-04-04-block-geometry-should-flatten-recursive-text-leaves-before-rebasing-richer-inline-shapes.md