re: Placement_*/RouteTest_* are Null_Test.tbl, and Enumeration is a self-index

The template object is stage\Null_Test.tbl: its key hashes as
name_hash("stage\" + "Null_Test.tbl"), the file stage-definition-table names as
EnumerateNullFrame. Ten records - 4 Frame_Test_Asteroid_01..04, 3
Placement_00..02, 2 RouteTest_00..01, Enumeration - and the nine carrying a
FrameCount are exactly the "9/9 for Null_Test.tbl" stage-mission-tables already
counted. The corpus knew the file and the count, not the record names. A second
object (the same five plus Enumeration, without the asteroid frames) matched
none of ten candidate names across sixteen prefixes.

Enumeration is a record that indexes its own object. Disc-wide: 7750 IDXD
objects, 360 carry one, and in 360/360 its field names equal exactly that
object's other record names - zero subsets, zero strays. Field/record counts
run from 2 past 25 ((3,3)x36, (9,9)x24, (13,13)x24, (2,2)x24, (25,25)x18,
(16,16)x12), every pair on the diagonal.

Enumeration vs Enumerate is one letter and opposite scope: Enumerate is
archive-naming's route-2 seed, a single-record object whose fields name OTHER
objects; Enumeration names the records of its own object. Written up in
idxd-container, which had left "an object's kind is known only from the caller
that loads it" open.

Sharper version of the previous correction: I credited the stage\ prefix to
archive_naming.py, but stage-mission-tables states it in prose ("The prefix is
stage\ - name_hash is case-insensitive") and its stagetbl.py examples pass
'stage\AIParams_S02.tbl'. Noted in asteroid-fields.md.

All fifteen artefacts byte-identical.

docs/re/structures/asteroid-fields.md

@@ -112,6 +112,12 @@ works here. (`Stage\` scores identically — the hash lower-cases.)
 **Two independent joins, 9/9 agreement**, and both leave the same tenth object
 unreferenced.
 
+⚠️ Sharper still, found a turn later: **[[stage-mission-tables]] already says it
+in words** — "The prefix is `stage\` — `name_hash` is case-insensitive, so its
+case is free" — and its `stagetbl.py` examples pass `'stage\AIParams_S02.tbl'`.
+The answer to my "🔴 does not reproduce by hash" was written in the doc that owns
+the stage tables.
+
 ## ✅ The 8 values are `index, quaternion(x,y,z,w), position(x,y,z)` (2026-08-28)
 
 Measured over every `Frame_*Asteroid*` record on the disc — **384 records,