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Record the migration's end-to-end numbers

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Song separation went from not computable — the reference sat below the floor —
to 0.38, with the floor falling from 0.1449 to 0.1185 and the gap widening.
Every structural block moved: scale 40 to 59%, orient 65 to 89%, layout 60 to
111%, texture 89 to 81%, motion 53 to 65% of the reference.

Container variety rose throughout, 0.0557 to 0.0815 to 0.0901, which is the stop
condition holding: the library did not homogenise as it converged on shared
content.

Coupling did not move and is recorded as such. Whether a song looks different in
proportion to how it sounds different is still unsolved, and the migration was
never aimed at it.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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flow-state/MIGRATION.md
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@ -187,12 +187,41 @@ built stages:
identity only 0.0299 container only 0.0557 identity = 54% of container
```
After the first eighteen scenes, over the eight that consume the cast:
After the first eighteen scenes, over the eight that consumed the cast:
```
identity only 0.1287 container only 0.0815 identity = 158% of container
```
Complete, over all thirty-two:
```
identity only 0.1054 container only 0.0901 identity = 117% of container
```
The number that matters in that row is `container only`, which went 0.0557 →
0.0815 → 0.0901 as the migration progressed. That is the stop condition below
holding: the library did not homogenise. `identity only` is noisier than it
looks because the scene it probes is picked from the migrated set and changes
between runs — Constellation, then Metaballs, then Floating Geometry — so read
it as "comparable to the container" rather than as a precise ratio.
End to end, song variety across twelve songs before and after the epic:
```
floor observed separation
before 0.1449 0.1508 not computable (the reference sat below the floor)
after 0.1185 0.1376 0.38
```
The floor fell and the gap widened, which is both halves of what the inversion
was supposed to buy. Every structural block moved with it — scale 40→59%,
orient 65→89%, layout 60→111%, texture 89→81%, motion 53→65% of reference.
Coupling did not move: -0.09, still indistinguishable from zero. Whether a song
LOOKS different in proportion to how it SOUNDS different remains unsolved, and
nothing in the migration addressed it.
Read that with its caveat: the stage set changed underneath the measurement, so
part of the jump is that Metaballs expresses a cast more strongly than
Constellation did rather than that the migration itself moved anything. What it