Fix assorted correctness bugs found via a code-review sweep

[ianjose]

Summary

A set of small, independent correctness fixes found while reviewing the engine, OS layer, published headers, and unit tests. Each change is a localized defect (memory safety, a wrong operator/variable, a resource leak on an error path, or an ineffective test) with no intended behavior change beyond the fix. They are grouped here for convenience; please take whichever subset you like and I can split into smaller PRs on request.

Highlights

Memory safety / crashes

• ese/sysver.cxx ErrLGFindFmtVersFromEfv: for ( ULONG i = ...; i >= 0; i-- ) never terminates for an unsigned counter and reads out of bounds on the not-found path (two sibling loops already use INT).
• ese/rec.cxx ErrRECIMakeKey: an array allocated with new[] was freed with scalar delete; also an && that should be || guarding a rgStartColumns[0] dereference.
• ese/space.cxx ErrSPCaptureSpaceTreePages: unchecked array allocation + a std::sort off-by-one that left the last element unsorted.
• ese/dbscan.cxx, ese/dataserializer.*: unique_ptr<T> owning new T[] (scalar delete of an array) -> unique_ptr<T[]>, plus a missing null-check before memcpy.

Resource leaks / error paths

• ese/revertsnapshot.cxx, ese/rbsdump.cxx, os/norm.cxx, os/edbg.cxx, noncore/eseshadow/*, noncore/interop/jetinterop.cpp, os/task.cxx.

Logic

• inc/pib.hxx ErrSetUserIoPriority: |= -> = so the QOS IO priority can be lowered again across calls.
• published/inc/stat.hxx: off-by-one (> 1 -> > 0) in the monotonicity guard of both ErrGetSampleHits implementations.
• os/string.cxx ErrOSSTRAsciiToUnicodeM: advance past the NUL so multi-strings beyond the first substring are converted.
• _log/logwrite.cxx, inc/ccsr.hxx: = -> == in asserts; _log/rstmap.cxx: use the inner-loop index; os/blockcache/_hashedlrukcachechunk.hxx: operator precedence; sync/sync.cxx: correct perf-data pointer in term; _xpress9/Xpress9DecLz77.c: misplaced SET_ERROR arg.

Tests (ese/*_test.cxx, test/ese/...)

• Wrong-variable / tautological assertions, a sizeof(pointer), an out-of-bounds read, a missing return on a detected inconsistency, a placement-new buffer mismatch, and a wildcard suffix-match fix.

Notes

• 33 files changed; each change is small and self-contained.
• Every candidate was verified against surrounding code; suspected-but-intentional patterns were deliberately left unchanged.
• Validated with editor/language-service diagnostics only (no full build here) - please run through CI.

Microsoft Reviewers: Open in CodeFlow

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