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`

4 files changed, 15 insertions, 15 deletions

diff --git a/src/zenremotestore/include/zenremotestore/builds/buildstorageoperations.h b/src/zenremotestore/include/zenremotestore/builds/buildstorageoperations.h
index 875b8593b..0d2eded58 100644
--- a/src/zenremotestore/include/zenremotestore/builds/buildstorageoperations.h
+++ b/src/zenremotestore/include/zenremotestore/builds/buildstorageoperations.h
@@ -161,7 +161,7 @@ public:
 	DownloadStatistics			 m_DownloadStats;
 	WriteChunkStatistics		 m_WriteChunkStats;
 	RebuildFolderStateStatistics m_RebuildFolderStateStats;
-	std::atomic<uint64_t>		 m_WrittenChunkByteCount;
+	std::atomic<uint64_t>		 m_WrittenChunkByteCount = 0;
 
 private:
 	struct BlockWriteOps
@@ -186,7 +186,7 @@ private:
 		uint32_t ScavengedContentIndex = (uint32_t)-1;
 		uint32_t ScavengedPathIndex	   = (uint32_t)-1;
 		uint32_t RemoteSequenceIndex   = (uint32_t)-1;
-		uint64_t RawSize			   = (uint32_t)-1;
+		uint64_t RawSize			   = (uint64_t)-1;
 	};
 
 	struct CopyChunkData
@@ -362,7 +362,7 @@ private:
 	const std::filesystem::path				  m_TempDownloadFolderPath;
 	const std::filesystem::path				  m_TempBlockFolderPath;
 
-	std::atomic<uint64_t> m_ValidatedChunkByteCount;
+	std::atomic<uint64_t> m_ValidatedChunkByteCount = 0;
 };
 
 struct FindBlocksStatistics
diff --git a/src/zenremotestore/include/zenremotestore/chunking/chunkblock.h b/src/zenremotestore/include/zenremotestore/chunking/chunkblock.h
index 7aae1442e..20b6fd371 100644
--- a/src/zenremotestore/include/zenremotestore/chunking/chunkblock.h
+++ b/src/zenremotestore/include/zenremotestore/chunking/chunkblock.h
@@ -24,7 +24,7 @@ struct ThinChunkBlockDescription
 
 struct ChunkBlockDescription : public ThinChunkBlockDescription
 {
-	uint64_t			  HeaderSize;
+	uint64_t			  HeaderSize = 0;
 	std::vector<uint32_t> ChunkRawLengths;
 	std::vector<uint32_t> ChunkCompressedLengths;
 };
diff --git a/src/zenremotestore/include/zenremotestore/chunking/chunkedcontent.h b/src/zenremotestore/include/zenremotestore/chunking/chunkedcontent.h
index d402bd3f0..f44381e42 100644
--- a/src/zenremotestore/include/zenremotestore/chunking/chunkedcontent.h
+++ b/src/zenremotestore/include/zenremotestore/chunking/chunkedcontent.h
@@ -231,7 +231,7 @@ GetSequenceIndexForRawHash(const ChunkedContentLookup& Lookup, const IoHash& Raw
 inline uint32_t
 GetChunkIndexForRawHash(const ChunkedContentLookup& Lookup, const IoHash& RawHash)
 {
-	return Lookup.RawHashToSequenceIndex.at(RawHash);
+	return Lookup.ChunkHashToChunkIndex.at(RawHash);
 }
 
 inline uint32_t
diff --git a/src/zenremotestore/include/zenremotestore/projectstore/remoteprojectstore.h b/src/zenremotestore/include/zenremotestore/projectstore/remoteprojectstore.h
index 2cf10c664..42786d0f2 100644
--- a/src/zenremotestore/include/zenremotestore/projectstore/remoteprojectstore.h
+++ b/src/zenremotestore/include/zenremotestore/projectstore/remoteprojectstore.h
@@ -92,22 +92,22 @@ public:
 
 	struct RemoteStoreInfo
 	{
-		bool		CreateBlocks;
-		bool		UseTempBlockFiles;
-		bool		AllowChunking;
+		bool		CreateBlocks	  = false;
+		bool		UseTempBlockFiles = false;
+		bool		AllowChunking	  = false;
 		std::string ContainerName;
 		std::string Description;
 	};
 
 	struct Stats
 	{
-		std::uint64_t m_SentBytes;
-		std::uint64_t m_ReceivedBytes;
-		std::uint64_t m_RequestTimeNS;
-		std::uint64_t m_RequestCount;
-		std::uint64_t m_PeakSentBytes;
-		std::uint64_t m_PeakReceivedBytes;
-		std::uint64_t m_PeakBytesPerSec;
+		std::uint64_t m_SentBytes		  = 0;
+		std::uint64_t m_ReceivedBytes	  = 0;
+		std::uint64_t m_RequestTimeNS	  = 0;
+		std::uint64_t m_RequestCount	  = 0;
+		std::uint64_t m_PeakSentBytes	  = 0;
+		std::uint64_t m_PeakReceivedBytes = 0;
+		std::uint64_t m_PeakBytesPerSec	  = 0;
 	};
 
 	struct ExtendedStats