Serialize logger error metadata safely

[miyaontherelay]

Summary

• normalize Error and unknown logger metadata without collapsing errors to empty objects
• preserve bounded, redacted structured diagnostics and issue context across factory logger boundaries
• contain getters, custom stack hooks, cycles, BigInt, and per-argument serialization failures

Validation

• focused: 4 files, 385 tests passed
• full: 39 files, 753 tests passed
• npm run build
• npm pack --dry-run
• git diff --check
• independent shadow audit: signed off with no blockers

Fixes #83

[gemini-code-assist]

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