Refactor round 2: fold duplicated command and inspector code

- applyCommands sit on ObjectEditCommand with a revert hook instead of
  five copies of the same preamble and undo
- actionIf replaces six identical Reset/Apply menu blocks, addNameField
  the three name rows, assetLink the two asset links
- requireStructuralObject replaces ten two-line preambles and drops the
  duplicate holder lookup
- __gm.objectsOf had no caller; the SMB remnant in e2e.sh is gone

Proven: check.sh 797 tests, full e2e 633 checks, smokes 24/19/20 against
the same bundle.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

e2e.sh

@@ -16,9 +16,8 @@ LOGDIR=$DIR/logs
 
 running() { systemctl is-active --quiet "$UNIT.service"; }
 rel() { echo "${1#"$DIR"/}"; }
-# Newest by name, not by mtime: the timestamped names sort chronologically and a share-mounted
-# worktree can hand out surprising mtimes. The glob demands that shape, so a hand-dropped file
-# in logs/ cannot outsort the newest run.
+# Newest by name, not by mtime: the timestamped names sort chronologically, and the glob demands
+# that shape, so a hand-dropped file in logs/ cannot outsort the newest run.
 latest_log() { ls -1 "$LOGDIR"/e2e-[0-9]*.log 2>/dev/null | tail -1; }
 
 start() {