fix: split 35+ consecutive if-return chain in calls.ts

[cs01]

Summary

• Split the generate() method in CallExpressionGenerator which had 35+ consecutive if-return blocks into 11 helper methods, each with ≤4 consecutive if-return blocks
• The native compiler's if-drop bug silently drops the 5th+ consecutive if-return block, causing function dispatch to fall through to generateGenericCall instead of the correct handler
• Affected functions: malloc, free, socket, bind, listen, accept, all _ts* tree-sitter APIs, btoa, atob, encodeURIComponent, decodeURIComponent, and more

Test plan

• All 437 tests pass
• verify:quick passes (tsc + Stage 0 + Stage 1 + tests)

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