docs(link): the phase the measurement cancelled, and the 452 wrong pictures it found on the way (Phase 6)

§16 planned deep animation keys and a bulk-fill switch. Measuring first changed
the phase: a complete one-direction animation set is 174,453 frames / 281.5 MB
(not the ~119,000 / ~117 MB §11 estimated), every frame carries its own centre
and 23,818 of 26,274 actions have frames of differing size — and the site
displays still pictures. So none of it was built (§11.2, org lead 2026-09-11);
`body/<id>/a<n>/f<k>` stays named in §5 and refused in practice.

§4.10 is what the walk found instead. A body's actions are a contiguous band and
the next body's begin immediately after, so one action past the ceiling is a real
record of another creature: 643 of 795 legacy bodies pass every check there and
452 are byte-identical to body+1's action 0. `Animations.GetAnimLength` is not
the ceiling — it disagrees with the index arithmetic on one body of this client,
by nine actions.

What shipped: the 73 bodies with no art at action 0 (a horse at `body/820/a23`),
the catalogue key carrying its action, the atlas join that reads it instead of
hardcoding `a0`, and the ceiling that makes the fallback walk safe. Catalogue
1,022 -> 1,095; EXTRACTOR_VERSION 2 -> 3; protocol stays 8.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016wDDVXWMDz82WqE1i969r4

website/SPAWN_ATLAS.md

@@ -233,10 +233,12 @@ custom creatures) and points each `shard_spawn_creatures.art` at its picture.
 Boot never calls the shard for this: the files change when an operator patches
 their client, which is an event they know about and the site does not.
 
-On this machine's stock client that is **1,022 creature portraits**, about a
-megabyte in total — 787 out of the legacy `anim*.mul` files and 235 more out of
+On this machine's stock client that is **1,095 creature portraits**, about a
+megabyte in total — 787 out of the legacy `anim*.mul` files, 235 more out of
 `AnimationFrame*.uop`, which ServUO's own decoder never opens
-([`../link/v8.md`](../link/v8.md) §4.9).
+([`../link/v8.md`](../link/v8.md) §4.9), and 73 more that have no art at the
+walk's first action and real art at a later one, which the import now falls back
+to (§11.2). Body 820 is one of them, and it is a horse.
 
 **NULL stays a first-class state, and always will be.** An install with no shard
 link has never imported one; a Linux shard host without `libgdiplus` cannot