Large Language Models (LLMs) have demonstrated remarkable capabilities, yet their performance in low-resource languages (LRLs), such as Swahili, often lags due to data scarcity and underrepresentation in pre-training. A key challenge is achieving robust cross-lingual lexical alignment, crucial for tasks like translation and cross-lingual information retrieval. This paper introduces Targeted Lexical Injection (TLI), a novel and efficient fine-tuning approach. We first demonstrate that Lugha-Llama-8B-wura, a Swahili-centric LLM, exhibits strong, near-perfect lexical alignment for Swahili-EnglishResearch goal: Does early-layer LoRA fine-tuning improve zero-shot cross-lingual natural language inference accuracy for low-resource African languages compared to full-model fine-tuning?Autonomous synthesis report generated by Assignee Research. Tribunal consensus score: 8.2/10.