fix: SDK bug fixes across runtime, codegen, and utilities

[wentzeld]

Summary

• Fix bigintToProtoBigInt sign loss for negative values and add float/NaN/Infinity validation
• Fix SecretsError producing [object Object] in error messages
• Add hexToBase64 input validation and bigintToBytes negative guard
• Fix Value class bugs: UInt64 error message, div safe param, isValueProto null safety, Decimal.parse regex
• Fix chain selector 0n falsy bug in network-lookup
• Remove debug || true in generate-sdk, defer create import, fix split('@') parsing
• Fix generate-sugar missing Report wrapping for ReportResponse outputs
• Fix generate-action $report type from string to boolean
• Add HTTP response.ok check in trigger-workflow
• Fix index.ts to return 500 for server errors instead of 400
• Add runner.ts null check for trigger payload
• Add runtime.ts i32 range validation for maxResponseSize
• Fix copy-paste log messages in standard tests