[From PR #945] Remove dead closure_turn_history parameter threading in closure_to_fun

[claude]

Background

Identified during review of PR #945 (fix(lisp): prevent closure and HOF state leaks).

Issue

closure_to_fun in apply.ex:355-490 destructures closure_turn_history from the closure tuple and passes it through 8 call sites (lines 386, 400, 414, 428, 476, 490) to eval_closure_args. Since closures now always store [] for turn_history (per the PR fix), and eval_closure_args already ignores it via _closure_turn_history at line 593, this parameter is dead code.

Fix

Mechanical cleanup:

1. Rename the destructured binding at line 355 to _closure_turn_history
2. Drop the parameter from eval_closure_args entirely (remove from 8 call sites and the function head)

Complexity

Low — purely mechanical rename + parameter removal, no semantic change.