fix(core): prevent buffer overruns and coordinate LMDB access - #69
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Fix fingerprint writer buffer overruns and unsafe LMDB environment ownership during parallel CLI operations. Writers flush at capacity; database handles share environments with coordinated writer, snapshot, and close lifetimes.
Validation: full Zig suite, writer and database concurrency regressions, macOS/Linux ASan/UBSan and TSan, and Linux/Windows cross-builds passed.