STANDING ORDER: section map draws the pit galleries, key in order

The section now shows 13, 14, 15 and 18 on a third level with the
incline from the plant floor, instead of footnoting them as not drawn,
and the key runs 6-18 in number order in two columns. Sheet 6 moves the
incline to the plant's north end to match.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

docs/scenarios/STANDING_ORDER_ART.md

@@ -184,7 +184,9 @@ trusting the exit code.
 **The Bellhouse section drawing.** A cutaway of the site with the Seat's locations
 numbered, and a key below the drawing. Issue 2 (v1.0) relabels the key for the rewrite and
 lists three pit-gallery locations as *not drawn*. Issue 3 (v1.1) adds the dormitories (16)
-and the canteen and cabins (17) on Level 2, and the Estate (18) in the galleries. Re-render with
+and the canteen and cabins (17) on Level 2, and draws the pit galleries as a third level —
+the Vigil hall (13), the coal roads (14), the Sump (15) and the Estate (18) — with the incline
+from the plant floor. The key runs in number order. Re-render with
 `rsvg-convert -w 2400 -h 1700` then `cwebp -q 88`. **This must be hand-built SVG and must not be
 prompted.** Midjourney will not hold legible text or accurate geography, and this drawing's
 whole job is labels. Two rules from AFTERIMAGE v3.1: numbered callouts with a key beneath