Repair cross-sheet identities and dependent caches

Review the independently proposed patch below, including its unchanged callers. One!A1 referring to Two!A1 is not a cycle. Separately, changing a source cell must invalidate every transitive dependent, including formulas cached before the update.

Review focus: Spreadsheet dependency engines

src/models/stack.mjs

BeforeProposed

+1−1

44 this.active = new Set();

55 }

66 key(sheet, cell) {

7 return cell;

7 return sheet + '!' + cell;

88 }

99 enter(sheet, cell) {

1010 const key = this.key(sheet, cell);

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