zenstore bug-fixes from static analysis pass (#815)

**Bug fixes across zenstore, zenremotestore, and related subsystems, primarily surfaced by static analysis.**

## Cache subsystem (cachedisklayer.cpp)

- Fixed tombstone scoping bug: tombstone flag and missing entry were recorded outside the block where data was removed, causing non-missing entries to be incorrectly tombstoned
- Fixed use-after-overwrite: `RemoveMemCachedData`/`RemoveMetaData` were called after `Payload` was overwritten on cache put, leaking stale data
- Fixed incorrect retry sleep formula (`100 - (3 - RetriesLeft) * 100` always produced the same or negative value; corrected to `(3 - RetriesLeft) * 100`)
- Fixed broken `break` missing from sidecar file read loop, causing reads past valid data
- Fixed missing format argument in three `ZEN_WARN`/`ZEN_ERROR` log calls (format string had `{}` placeholders with no corresponding argument, or vice versa)
- Fixed elapsed timer being accumulated inside the wrong scope in `HandleRpcGetCacheRecords`
- Fixed test asserting against unserialized `RecordPolicy` instead of the deserialized `Loaded` copy
- Initialized `AbortFlag`/`PauseFlag` atomics at declaration (UB if read before first write)

## Build store (buildstore.cpp / buildstore.h)

- Fixed wrong variable used in warning log: used loop index `ResultIndex` instead of `Index`/`MetaLocationResultIndexes[Index]`, logging wrong hash values
- Fixed `sizeof(AccessTimesHeader)` used instead of `sizeof(AccessTimeRecord)` when advancing write offset, corrupting the access times file if the sizes differ
- Initialized `m_LastAccessTimeUpdateCount` atomic member (was uninitialized)
- Changed map iteration loops to use `const auto&` to avoid unnecessary copies

## Project store (projectstore.cpp / projectstore.h)

- Fixed wrong iterator dereferenced in `IterateChunks`: used `ChunkIt->second` (from a different map lookup) instead of `MetaIt->second`
- Fixed wrong assert variable: `Sizes[Index]` should be `RawSizes[Index]`
- Fixed `MakeTombstone`/`IsTombstone` inconsistency: `MakeTombstone` was zeroing `OpLsn` but `IsTombstone` checks `OpLsn.Number != 0`; tombstone creation now preserves `OpLsn`
- Fixed uninitialized `InvalidEntries` counter
- Fixed format string mismatch in warning log
- Initialized `AbortFlag`/`PauseFlag` atomics; changed map iteration to `const auto&`

## Workspaces (workspaces.cpp)

- Fixed missing alias registration when a workspace share is updated: alias was deleted but never re-inserted
- Fixed integer overflow in range clamping: `(RequestedOffset + RequestedSize) > Size` could wrap; corrected to `RequestedSize > Size - RequestedOffset`
- Changed map iteration loops to `const auto&`

## CAS subsystem (cas.cpp, caslog.cpp, compactcas.cpp, filecas.cpp)

- Fixed `IterateChunks` passing original `Payload` buffer instead of the modified `Chunk` buffer (content type was set on the copy but the original was sent to the callback)
- Fixed invalid `std::future::get()` call on default-constructed futures
- Fixed sign-comparison in `CasLogFile::Replay` loop (`int i` vs `size_t`)
- Changed `CasLogFile::IsValid` and `Open` to take `const std::filesystem::path&` instead of by value
- Fixed format string in `~CasContainerStrategy` error log

## Remote store (zenremotestore)

- Fixed `FolderContent::operator==` always returning true: loop variable `PathCount` was initialized to 0 instead of `Paths.size()`
- Fixed `GetChunkIndexForRawHash` looking up from wrong map (`RawHashToSequenceIndex` instead of `ChunkHashToChunkIndex`)
- Fixed double-counted `UniqueSequencesFound` stat (incremented in both branches of an if/else)
- Fixed `RawSize` sentinel value truncation: `(uint32_t)-1` assigned to a `uint64_t` field; corrected to `(uint64_t)-1`
- Initialized uninitialized atomic and struct members across `buildstorageoperations.h`, `chunkblock.h`, and `remoteprojectstore.h`

1 files changed, 1 insertions, 3 deletions

diff --git a/src/zenremotestore/chunking/chunkedcontent.cpp b/src/zenremotestore/chunking/chunkedcontent.cpp
index 62c927508..c09ab9d3a 100644
--- a/src/zenremotestore/chunking/chunkedcontent.cpp
+++ b/src/zenremotestore/chunking/chunkedcontent.cpp
@@ -166,7 +166,6 @@ namespace {
 					if (Chunked.Info.ChunkSequence.empty())
 					{
 						AddChunkSequence(Stats, OutChunkedContent.ChunkedContent, ChunkHashToChunkIndex, Chunked.Info.RawHash, RawSize);
-						Stats.UniqueSequencesFound++;
 					}
 					else
 					{
@@ -186,7 +185,6 @@ namespace {
 										 Chunked.Info.ChunkHashes,
 										 ChunkSizes);
 					}
-					Stats.UniqueSequencesFound++;
 				}
 			});
 			Stats.FilesChunked++;
@@ -253,7 +251,7 @@ FolderContent::operator==(const FolderContent& Rhs) const
 	if ((Platform == Rhs.Platform) && (RawSizes == Rhs.RawSizes) && (Attributes == Rhs.Attributes) &&
 		(ModificationTicks == Rhs.ModificationTicks) && (Paths.size() == Rhs.Paths.size()))
 	{
-		size_t PathCount = 0;
+		size_t PathCount = Paths.size();
 		for (size_t PathIndex = 0; PathIndex < PathCount; PathIndex++)
 		{
 			if (Paths[PathIndex].generic_string() != Rhs.Paths[PathIndex].generic_string())