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## Changes - `activity/synthesis.go` — 5 synthesis pipeline activities - `activity/synthesis_test.go` — 10 unit tests ## Activities 1. **ChunkAndEmbedActivity** — deterministic chunk ID + memory service ingest 2. **ExtractEntitiesActivity** — wiki-link, proper noun, technical term extraction 3. **ExtractFactsActivity** — 6 verb patterns with entity-boosted confidence 4. **DetectContradictionsActivity** — query + pre-filter + severity classification 5. **PersistSynthesisActivity** — save entities + facts to memory service ## Validation - 10 unit tests pass - `go build ./...` clean - Full suite: 35 packages pass, 0 failures --------- Co-authored-by: poimen <[email protected]> Reviewed-on: #13