An inline/nested function expression's own params and locals were not folded
into the indirect_call shadow set, because function_expression was missing from
the JS/TS function_boundary_types even though walk_calls' closure-descend branch
already handles it. A bare reference to such a param, passed as a call argument,
fabricated an INFERRED indirect_call to an unrelated same-named callable. Adding
function_expression to the boundary sets routes it through the same shadow path
arrows use. Same family as the catch/arrow/loop/external-import (#2757) shadows.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
