Add converted markdown for new sources

references/papers/llm-inference-optimization/test-reviewer-pr-comment.md

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+# Test: Reviewer PR Comment
+
+This is a test file to verify the reviewer agent correctly posts a PR summary comment.
+
+It covers the following LLM inference concept: speculative decoding allows a small draft model
+to generate candidate tokens that a larger model then verifies in parallel, significantly
+improving throughput without changing output quality.
+
+This file exists only to trigger the reviewer workflow and will be removed after verification.

references/papers/llm-inference-optimization/test-reviewer-pr-comment.meta.json

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+{
+  "url": "https://example.com/test-reviewer-pr-comment",
+  "title": "Test: Reviewer PR Comment",
+  "source_type": "doc",
+  "author": "Test",
+  "fetched_at": "2026-05-23"
+}