fix: split named-object-dispatch if-chains to prevent if-drop bug

[cs01]

Summary

• Splits 7 dispatch functions in named-object-dispatch.ts that exceeded the 4-branch if-return safety limit
• handleFsMethod: 27 → 5 sub-functions (≤4 each) + 5-branch coordinator
• handlePathMethod: 9 → 2 sub-functions (4 each) + 3-branch coordinator
• handleProcessMethod: 10 → 2 sub-functions (4 each) + 4-branch coordinator
• handleCryptoMethod: 7 → 1 sub-function (4) + 4-branch coordinator
• handleSqliteMethod: 7 → 1 sub-function (4) + 4-branch coordinator
• handleOsMethod: 7 → 1 sub-function (4) + 4-branch coordinator
• handleAssertMethod: 5 → 1 sub-function (4) + 2-branch coordinator
• handleChadScriptMethod: 5 → 1 sub-function (4) + 2-branch coordinator
• Prevents the native compiler's if-drop bug (5th+ consecutive if-return blocks silently dropped)

Test plan

• All 434 tests pass
• Self-hosting verification passes (verify:quick)

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