Consolidate duplicated editor code, trim comments, refresh README

Split GraphCanvas (1076 -> 831 lines) into EdgeLayer and graphMenus;
the port and marker menus were the same list and are now one function.
Value specs of the inspector and the list tab share valueSpecs.ts, and
the remaining copies (compound commands, type glyphs, typed asset
lookup, name rule, play/editor world setup, marquee) are merged.

Four copies had already drifted apart; merging them fixes:
- "Disconnect N links" in the port menu is one undo step, not N
- "+ Add collider" is hidden on a placed container instance, as in
  the hierarchy menu, instead of always failing
- a bool property coerced from the text "false" becomes false
- a port command on an unknown node type reports instead of crashing

Comment-only edits leave the bundle byte-identical. README corrected in
35 places (step limit, jump-run clock, suite duration, 409 body, ...).

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

src/editor/graph/folding.ts

@@ -10,10 +10,8 @@ export function foldedEdgeShown(edge: GraphEdge, selected: ReadonlySet<string>,
 }
 
 /**
- * Which mark a folded edge end belongs to. One port, one mark: drawn per edge instead, several
- * hidden links out of the same port stack their stub, dot and name on the very same pixels.
- * The separator is NUL: a printable one merges node "a b" + port "c" with node "a" + port "b c".
- * A collapsed node draws all its ports on one point per side, so there it is one mark per side.
+ * One mark per port (per side on a collapsed node), so hidden links of one port don't stack on the same
+ * pixels. The separator is NUL: a printable one merges node "a b" + port "c" with node "a" + port "b c".
  */
 export function foldMarkKey(
   side: { node: string; port: string },