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/core/graph/keyRepeat.ts

@@ -1,9 +1,6 @@
 /**
- * The auto-repeat of `On key down`, kept apart from the runtime so it can be checked without a
- * world: given how long the key has been held, how often does the node fire this frame?
- *
- * The browser's own key auto-repeat is deliberately not used (`Input.press` drops it): its delay
- * and rate are an operating-system setting, not something a game can tune.
+ * The auto-repeat of `On key down`, kept apart from the runtime so it can be tested without a world.
+ * The browser's own repeat is dropped (`Input.press`): its delay and rate are an OS setting, not tunable.
  */
 
 /** Smallest repeat gap, mirroring `On timer`; 0 keeps its own meaning of "every frame". */