Claude config, some bug fixes (#813)

* Claude config updates
* Bug fixes and hardening across `zencore` and `zenhttp`, identified via static analysis.

### zencore

- **`ZEN_ASSERT` macro** -- extended to accept an optional string message literal; added `ZEN_ASSERT_MSG_` helper for message formatting. Callers needing runtime fmt-style formatting should use `ZEN_ASSERT_FORMAT`.
- **`MpscQueue`** -- fixed `TypeCompatibleStorage` to use a properly-sized `char Storage[sizeof(T)]` array instead of a single `char`; corrected `Data()` to cast `&Storage` rather than `this`; switched cache-line alignment to a fixed constant to avoid GCC's `-Winterference-size` warning. Enabled previously-disabled tests.
- **`StringBuilderImpl`** -- initialized `m_Base`/`m_CurPos`/`m_End` to `nullptr`. Fixed `StringCompare` return type (`bool` -> `int`). Fixed `ParseInt` to reject strings with trailing non-numeric characters. Removed deprecated `<codecvt>` include.
- **`NiceNumGeneral`** -- replaced `powl()` with integer `IntPow()` to avoid floating-point precision issues.
- **`RwLock::ExclusiveLockScope`** -- added move constructor/assignment; initialized `m_Lock` to `nullptr`.
- **`Latch::AddCount`** -- fixed variable type (`std::atomic_ptrdiff_t` -> `std::ptrdiff_t` for the return value of `fetch_add`).
- **`thread.cpp`** -- fixed Linux `pthread_setname_np` 16-byte name truncation; added null check before dereferencing in `Event::Close()`; fixed `NamedEvent::Close()` to call `close(Fd)` outside the lock region; added null guard in `NamedMutex` destructor; `Sleep()` now returns early for non-positive durations.
- **`MD5Stream`** -- was entirely stubbed out (no-op); now correctly calls `MD5Init`/`MD5Update`/`MD5Final`. Fixed `ToHexString` to use the correct string length. Fixed forward declarations. Fixed tests to compare `compare() == 0`.
- **`sentryintegration.cpp`** -- guard against null `filename`/`funcname` in spdlog message handler to prevent a crash in `fmt::format`.
- **`jobqueue.cpp`** -- fixed lost job ID when `IdGenerator` wraps around zero; fixed raw `Job*` in `RunningJobs` map (potential use-after-free) to `RefPtr<Job>`; fixed range-loop copies; fixed format string typo.
- **`trace.cpp`** -- suppress GCC false-positive warnings in third-party `trace.h` include.

### zenhttp

- **WebSocket close race** (`wsasio`, `wshttpsys`, `httpwsclient`) -- `m_CloseSent` promoted from `bool` to `std::atomic<bool>`; close check changed to `exchange(true)` to eliminate the check-then-set data race.
- **`wsframecodec.cpp`** -- reject WebSocket frames with payload > 256 MB to prevent OOM from malformed/malicious frames.
- **`oidc.cpp`** -- URL-encode refresh token and client ID in token requests (`FormUrlEncode`); parse `end_session_endpoint` and `device_authorization_endpoint` from OIDC discovery document.
- **`httpclientcommon.cpp`** -- propagate error code from `AppendData` when flushing the cache buffer.
- **`httpclient.h`** -- initialize all uninitialized members (`ErrorCode`, `UploadedBytes`, `DownloadedBytes`, `ElapsedSeconds`, `MultipartBoundary` fields).
- **`httpserver.h`** -- fix `operator=` return type for `HttpRpcHandler` (missing `&`).
- **`packageformat.h`** -- fix `~0u` (32-bit truncation) to `~uint64_t(0)` for a `uint64_t` field.
- **`httpparser`** -- initialize `m_RequestVerb` in both declaration and `ResetState()`.
- **`httpplugin.cpp`** -- initialize `m_BasePort`; fix format string missing quotes around connection name.
- **`httptracer.h`** -- move `#pragma once` before includes.
- **`websocket.h`** -- initialize `WebSocketMessage::Opcode`.

### zenserver

- **`hubservice.cpp`** -- fix two `ZEN_ASSERT` calls that incorrectly used fmt-style format args; converted to `ZEN_ASSERT_FORMAT`.

4 files changed, 10 insertions, 10 deletions

diff --git a/src/zenhttp/include/zenhttp/httpclient.h b/src/zenhttp/include/zenhttp/httpclient.h
index d87082d10..bec4984db 100644
--- a/src/zenhttp/include/zenhttp/httpclient.h
+++ b/src/zenhttp/include/zenhttp/httpclient.h
@@ -128,7 +128,7 @@ public:
 
 	struct ErrorContext
 	{
-		int			ErrorCode;
+		int			ErrorCode = 0;
 		std::string ErrorMessage;
 
 		/** True when the error is a transport-level connection failure (connect timeout, refused, DNS) */
@@ -179,19 +179,19 @@ public:
 		KeyValueMap Header;
 
 		// The number of bytes sent as part of the request
-		int64_t UploadedBytes;
+		int64_t UploadedBytes = 0;
 
 		// The number of bytes received as part of the response
-		int64_t DownloadedBytes;
+		int64_t DownloadedBytes = 0;
 
 		// The elapsed time in seconds for the request to execute
-		double ElapsedSeconds;
+		double ElapsedSeconds = 0.0;
 
 		struct MultipartBoundary
 		{
-			uint64_t		OffsetInPayload;
-			uint64_t		RangeOffset;
-			uint64_t		RangeLength;
+			uint64_t		OffsetInPayload = 0;
+			uint64_t		RangeOffset		= 0;
+			uint64_t		RangeLength		= 0;
 			HttpContentType ContentType;
 		};
 
diff --git a/src/zenhttp/include/zenhttp/httpserver.h b/src/zenhttp/include/zenhttp/httpserver.h
index 02cccc540..c1152dc3e 100644
--- a/src/zenhttp/include/zenhttp/httpserver.h
+++ b/src/zenhttp/include/zenhttp/httpserver.h
@@ -440,7 +440,7 @@ public:
 	~HttpRpcHandler();
 
 	HttpRpcHandler(const HttpRpcHandler&) = delete;
-	HttpRpcHandler operator=(const HttpRpcHandler&) = delete;
+	HttpRpcHandler& operator=(const HttpRpcHandler&) = delete;
 
 	void AddRpc(std::string_view RpcId, std::function<void(CbObject& RpcArgs)> HandlerFunction);
 
diff --git a/src/zenhttp/include/zenhttp/packageformat.h b/src/zenhttp/include/zenhttp/packageformat.h
index c90b840da..1a5068580 100644
--- a/src/zenhttp/include/zenhttp/packageformat.h
+++ b/src/zenhttp/include/zenhttp/packageformat.h
@@ -68,7 +68,7 @@ struct CbAttachmentEntry
 struct CbAttachmentReferenceHeader
 {
 	uint64_t PayloadByteOffset	= 0;
-	uint64_t PayloadByteSize	= ~0u;
+	uint64_t PayloadByteSize	= ~uint64_t(0);
 	uint16_t AbsolutePathLength = 0;
 
 	// This header will be followed by UTF8 encoded absolute path to backing file
diff --git a/src/zenhttp/include/zenhttp/websocket.h b/src/zenhttp/include/zenhttp/websocket.h
index 7a6fb33dd..bc3293282 100644
--- a/src/zenhttp/include/zenhttp/websocket.h
+++ b/src/zenhttp/include/zenhttp/websocket.h
@@ -22,7 +22,7 @@ enum class WebSocketOpcode : uint8_t
 
 struct WebSocketMessage
 {
-	WebSocketOpcode Opcode;
+	WebSocketOpcode Opcode = WebSocketOpcode::kText;
 	IoBuffer		Payload;
 	uint16_t		CloseCode = 0;
 };