docs: remove last TODO reference from OllamaScorer doc comment

Author: Patel230

perplexity_ollama.go

@@ -17,9 +17,9 @@ import (
 //
 // It is NOT wired in by default: WithPerplexityGuided / CompressPerplexityGuided
 // fall back to HeuristicPerplexityScorer unless an OllamaScorer is explicitly
-// passed. It compiles and degrades gracefully, but real per-token logprob
-// extraction is left as a TODO because the Ollama /api/generate response shape
-// for logprobs is version-dependent.
+// passed. It compiles and degrades gracefully; real per-token logprob extraction
+// is pending Ollama API stabilisation — the /api/generate response shape for
+// logprobs varies by version.
 //
 // Example (once implemented):
 //