Fix raise NotImplemented to raise NotImplementedError in wrap_llm_lora

[Mr-Neutr0n]

Summary

• NotImplemented is a built-in constant used for rich comparison methods, not an exception class. Raising it directly produces a confusing TypeError: exceptions must derive from BaseException instead of the expected NotImplementedError.
• This fixes the else branch in wrap_llm_lora() to properly raise NotImplementedError with a descriptive message indicating which LLM architecture is unsupported.

Before (broken):

raise NotImplemented
# TypeError: exceptions must derive from BaseException

After (fixed):

raise NotImplementedError(f'Unsupported architecture: {self.llm_arch_name}')
# NotImplementedError: Unsupported architecture: SomeModel

Test plan

• Verified that raise NotImplemented produces TypeError in Python
• Confirmed this is the only instance of this pattern in the codebase
• The fix follows the same pattern used elsewhere in the file (e.g., line 84)

[Mr-Neutr0n]

Closing this one to tidy up my open pull requests.

It's been open around five months with no review activity, and I'd rather withdraw it than leave it sitting in your queue. Nothing needed from you, and no hard feelings at all.

If the fix is still wanted, this can be reopened, or I'm happy to redo it properly against current main. Apologies for the noise.