Answer Value In Array on a non-array operand as a missing element #97

Problem

After #93 and #95, Bastion on athena main (docs/scenario-examples/valid/bastion.json plus buttons for every slot on both players) ends not_modeled at tick 0:

{ "status": "not_modeled", "construct": "valueInArray on Null", "tick": 0,
  "location": { "rule": 167, "name": "[Event/先知] Collapse undecided next event under observation", "eventPlayer": "p2", "condition": 1 } }

Condition 1 evaluates Value In Array(First Of((Event Player).playerTitles), True). playerTitles is unset (Null), so First Of returns Null and Value In Array receives a non-array. call.rs returns Null for an out-of-range index but stops not_modeled for any non-array operand.

Catalog evidence

• valueInArray: "The value found at a specific element of an array. Results in 0 if the element does not exist."
• firstOf: "The value at the start of the specified array. Results in 0 if the specified array is empty."

A non-array operand has no element at any index, so the catalog sentence for "the element does not exist" covers it. The catalog does not state this case explicitly.

Scope

• Make Value In Array on a non-array operand (Null, number, text, vector, player, bool) answer the same value as an out-of-range index does today (Null, which compares equal to 0 as for the existing out-of-range case). Check that First Of on Null and on an empty array already answer the same way and make them consistent.
• Record this in docs/findings.md as modeled, not measured, with the two catalog sentences as the basis, and add a probe request line if the repo keeps one for modeled-not-measured choices (follow the existing entries for out-of-range index).
• Update the modeled-values list in docs/scenario-format.md or docs/simulator-interface.md wherever it states that a non-array operand stops the run.

Acceptance

• Tests: non-array operand of each type; First Of of Null and of an empty array; the out-of-range cases unchanged; use inside Compare and Is True For Any.
• Bastion rerun with the scenario above: report the new first stop, or completion. Parent: Run Bastion to completion on athena-sim #45.