parser: rejects arr[i](args) — ElementAccessExpression as callee

[cs01]

Bug

Parser rejects arr[i](args) — calling a function retrieved via array indexing.

const fns: Array<(x: string) => void> = [...];
fns[0]("hello");   // ← parse error: Unsupported call expression: ElementAccessExpression

Error: Unsupported call expression: ElementAccessExpression.

Impact

Together with the function-array codegen issue, blocks idiomatic dispatch-table and event-emitter patterns. Hit during lib/net.ts implementation (PR #585).

Likely fix location

src/parser/ or wherever the TS AST visitor handles CallExpression — needs to accept ElementAccessExpression as a callee alongside Identifier and PropertyAccessExpression.

[cs01]

Parser portion fixed by #593 (merged to main). Parser now accepts ElementAccessExpression as a callee, lowering arr[i](args) to a method_call. End-to-end execution still needs function-pointer array codegen — tracked in #586 / #598.