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This PR adds end-to-end Unix domain socket (UDS) support, allowing zen CLI to discover and connect to UDS-only servers automatically.
- **`unix://` URI scheme in zen CLI**: The `-u` / `--hosturl` option now accepts `unix:///path/to/socket` to connect to a zenserver via a Unix domain socket instead of TCP.
- **Per-instance shared memory for extended server info**: Each zenserver instance now publishes a small shared memory section (keyed by SessionId) containing per-instance data that doesn't fit in the fixed-size ZenServerEntry -- starting with the UDS socket path. This is a 4KB pagefile-backed section on Windows (`Global\ZenInstance_{sessionid}`) and a POSIX shared memory object on Linux/Mac (`/UnrealEngineZen_{sessionid}`).
- **Client-side auto-discovery of UDS servers**: `zen info`, `zen status`, etc. now automatically discover and prefer UDS connections when a server publishes a socket path. Servers running with `--no-network` (UDS-only) are no longer invisible to the CLI.
- **`kNoNetwork` flag in ZenServerEntry**: Servers started with `--no-network` advertise this in their shared state entry. Clients skip TCP fallback for these servers, and display commands (`ps`, `status`, `top`) show `-` instead of a port number to indicate TCP is not available.
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- Improvement: Use consistent language for command line argument parsing errors
- Improvement: Changed zen command parsing errors to output help first and error last to make it easier to spot the error
- Improvement: Refactor zen command return codes to conform to valid Linux range (0-255)
kSuccess = 0,
kOtherError = 1,
kBadInput = 2,
kOutOfMemory = 16,
kOutOfDisk = 17,
kAssertError = 70,
kHttpOtherClientError = 80,
kHttpCantConnectError = 81,
kHttpNotFound = 66, // NotFound(404)
kHttpUnauthorized = 77, // Unauthorized(401),
kHttpSLLError = 82,
kHttpForbidden = 83, // Forbidden(403)
kHttpTimeout = 84, // RequestTimeout(408)
kHttpConflict = 85, // Conflict(409)
kHttpNoHost = 86,
kHttpOtherServerError = 90,
kHttpInternalServerError = 91, // InternalServerError(500)
kHttpServiceUnavailable = 69, // ServiceUnavailable(503)
kHttpBadGateway = 92, // BadGateway(502)
kHttpGatewayTimeout = 93, // GatewayTimeout(504)
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