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re: F6 unit 6 -- pteff03a is not submitted at any size; the collapsed-scale candidate dies

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Unit 5 filtered on height, so a collapsed quad would have been invisible to
it by construction. Dropping that filter: across the whole title era,
frames >=700, every quad regardless of size --

  RIGHT->LEFT travellers (pteff03a's direction):  0
  LEFT->RIGHT travellers:                         2  (both pteff03)
  static shapes:                                 10
  degenerate/collapsed quads:                     0

Not one quad travels right-to-left in the entire title era at any size, and
nothing is submitted collapsed. So pteff03a is absent from the draw stream
-- not drawn invisibly, not drawn at zero scale. That strengthens unit 5
from "no tall quad of that size" to "no quad of that motion at all".

All three candidate mechanisms are now dead: the zero-alpha skip is weak on
its own terms (explains opening frames, not a whole run), the focus/variant
link was eliminated by the port's wider survey (linked targets chain across
unrelated element kinds -- on one menu a sweep points at a button, so the
field is a chain pointer rather than a variant selector), and collapsed
scale dies here.

Recording that as the state rather than proposing a fourth candidate.
Three have been named and three have failed, two by checks that took
minutes. A fourth guess before the human's "one streak or two" look would
be guessing against an answer about to arrive for free.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Jc4pciRArGHfxGGhEbwp5t
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# F6 unit 6 — `pteff03a` is not submitted **at any size**: absent, not collapsed
**Status: ✅ measured ⟨capture⟩ ×1.** 2026-09-02.
**Question:** is `pteff03a` absent from the draw stream, or submitted at zero /
collapsed scale?
**Look at:** any quad travelling right-to-left, at *any* size. Pass = found; fail =
none.
**Not covered:** why it is absent — still unknown.
---
Unit 5 filtered on **height**, so a collapsed quad would have been invisible to it
by construction. This scan drops that filter.
Whole title era, frames ≥ 700, every quad regardless of size:
```
RIGHT->LEFT travellers (pteff03a's declared direction): 0
LEFT->RIGHT travellers: 2 (both pteff03)
static shapes: 10
degenerate/collapsed quads (w<0.02 or h<0.02): 0
```
> **Not one quad travels right-to-left in the entire title era, at any size, and
> nothing is submitted collapsed.** `pteff03a` is absent from the draw stream —
> not drawn invisibly, not drawn at zero scale.
This strengthens unit 5 from *"no tall quad of that size"* to *"no quad of that
motion at all"*, which is the stronger statement and the one that matters.
## 🔴 All three candidate mechanisms are now dead, and I have no fourth
| candidate | status |
|---|---|
| a **zero-alpha skip** | weak on its own terms — it explains opening frames, not a whole run, and the leaf reaches non-trivial alpha well inside the captured window |
| a **focus/variant link** selecting one of the pair | **eliminated by the port**: the linked targets chain across unrelated element kinds — on one menu a sweep points at a *button* — so the field is a chain pointer, not a variant selector |
| **collapsed scale** | **eliminated here** |
**So the honest position is that neither agent has a mechanism.** The element is
declared in `GP_TITLE` build 4 as `ptloop02.rat`, element 12, beside `ptloop01.rat`
as element 11 — identical pivots, identical keyframe times — and the game never
submits it.
⚠️ **I am recording that as the state rather than proposing a fourth candidate.**
Three have now been named and three have failed, two of them by a check that took
minutes. A fourth guess before the human's *"one streak or two?"* look would be
guessing against an answer that is about to arrive for free.
## Reach
⟨capture⟩ ×1, one boot, the title era of one window. The scan is exhaustive over
every quad in the stream, so the absence is not a filtering artefact — which was
the specific weakness of unit 5 that this unit exists to close.