Fix SQLITE_SERIALIZE_NOCOPY buffer ownership

[vinzenz]

Summary

• Preserve SQLite-owned buffers returned with SQLITE_SERIALIZE_NOCOPY.
• Document no-copy behavior and errors for unavailable in-memory images.
• Add coverage for database usability, image parity, and file-backed failures.

Testing

• Added serialization tests for no-copy ownership and connection usability.
• Verified no-copy output matches the owning-copy image.
• Verified file-backed databases throw for SQLITE_SERIALIZE_NOCOPY while remaining usable.

Fixes #53

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between d83b6a5 and 6ef4ac5.

📒 Files selected for processing (3)

• include/sqlite/serialization.hpp
• src/sqlite/serialization.cpp
• tests/test_serialization.cpp

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[vinzenz]

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