docs: add v0.2.0 release notes

RELEASE_NOTES.md

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+# news-mcp release notes
+
+## v0.2.0 — embedding-aware clustering and richer agent tools
+
+### Highlights
+- Optional Ollama embedding path for clustering (`NEWS_EMBEDDINGS_ENABLED=true`)
+- Configurable Ollama base URL and embedding model
+- Tunable embedding similarity threshold (`NEWS_EMBEDDING_SIMILARITY_THRESHOLD`)
+- New agent tool: `get_related_entities(subject, timeframe, limit)`
+- Optional article payloads for `get_latest_events`, `get_events_for_entity`, and `get_event_summary`
+- Improved emerging-topic scoring with co-occurrence and importance weighting
+- Blacklist enforcement back-clean script for stored clusters
+- Embedding backfill script for older clusters
+- Embedding similarity analysis script for threshold tuning
+- Embedding-based merge script with dry-run and wet modes
+- Article dedup cleanup for repeated article variants inside clusters
+
+### Notes
+- Ollama embeddings are tried first when enabled; heuristic clustering remains the fallback.
+- The merge script is intentionally destructive and should be preceded by a dry run.
+- The article dedup cleanup script is safe to run after ingestion or on the historical dataset.