Add filename parameter for bytes-based loading

[williballenthin]

Summary

• Adds a filename parameter to Speakeasy.load_module() and Speakeasy.load_shellcode() (and their internal implementations in Win32Emulator and WinKernelEmulator)
• When loading from bytes without a file path, the emulator previously defaulted to using the SHA256 hash as the module name — now users can override this with a meaningful filename
• Windows-style paths are handled correctly via ntpath.basename()

Usage

se = Speakeasy()
mod = se.load_module(data=pe_bytes, filename="malware.dll")
se.run_module(mod)

Closes #16

Test plan

• test_load_module_filename_override — bytes + filename sets correct file_name/mod_name
• test_load_module_filename_strips_directory — Windows paths are basename-stripped
• test_load_module_path_still_works — path-only loading unchanged
• test_load_module_filename_overrides_path — filename takes precedence over path
• test_load_module_kernel_filename_override — kernel driver loading with filename
• Full test suite passes (pre-existing failures only)

🤖 Generated with Claude Code

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[mr-tz]

LGTM besides the highlighted tests

[mr-tz]

Thanks