feat(asset-bridge): the 73 bodies action 0 could not see, and the ceiling that makes looking safe (Phase 6)

The catalogue asked every body for action 0 and reported the rest absent. 73 of
this client's bodies have no art there and real art deeper — body 820's first
drawn action is 23, and it is a horse — so they rendered as text on the bestiary.
The catalogue now falls back to the first action that has art, and the key names
that action (`body/820/a23`). 1,022 -> 1,095 rows.

Walking the action axis is the one thing that can walk off the end of a body's
slots, and the slots after a body's band are the NEXT BODY'S. Measured here: one
action past the band, 643 of 795 legacy bodies return a fully validated picture
and 452 of those are byte-identical to body+1's action 0 (body 1 action 22 is an
ettin; body 3's is an imp, both confirmed by rendering them). Phase 0's validator
cannot catch that — the record is real — so the ceiling refuses the ADDRESS, in
ResolveAnimation where every caller already goes.

The ceiling is the index banding, never `Animations.GetAnimLength`: for a body
reaching file type 5 as id 34 that function answers 22 while the arithmetic gives
13, and the difference is nine actions of another creature's art.

A fetch serves only the key the catalogue chose for that body. `body/820/a0` and
`body/400/a2` come back `unsupported` with the chosen action alongside, never by
decoding what was asked for.

`EXTRACTOR_VERSION` 2 -> 3 (unchanged input, a different answer). Protocol stays
8 — `action` on a manifest/fetch row is additive.

Deep frame keys and the bulk-fill switch that §16 planned for this phase were
NOT built: the site displays still pictures, and a complete one-direction
animation set measures 174,453 frames / 281.5 MB against no consumer (docs
§11.2, org lead 2026-09-11).

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

overlay/Scripts/Custom/Bridge/BridgeAssets.cs

@@ -85,8 +85,13 @@ namespace Server.Custom.Bridge
         ///     stock client is 235 new sprites and two of them player-character bodies; and the
         ///     player-body set no longer carries ghost ids. Every client file is byte-identical
         ///     and the answer is different, which is precisely what this number exists to say.
+        ///
+        ///     **3** — phase 6 (§4.10, §11.2). A body with no art at action 0 is catalogued at
+        ///     the first action that has any, and its key names that action. 74 more bodies on a
+        ///     stock client, no existing key's bytes changed — but a body that was absent is now
+        ///     a row, which is the same "unchanged input, different answer" this number covers.
         /// </summary>
-        public const int EXTRACTOR_VERSION = 2;
+        public const int EXTRACTOR_VERSION = 3;
 
         // ── the one slot (§3.2) ──────────────────────────────────────────────────────────────