feat: Task 4 - Add NFO check to download flow

- Integrate NFO checking into SeriesApp.download() method
- Auto-create NFO and media files when missing (if configured)
- Add progress events: nfo_creating, nfo_completed, nfo_failed
- NFO failures don't block episode downloads
- Add 11 comprehensive integration tests (all passing)
- Respect all NFO configuration settings
- No regression in existing tests (1284 passing)

docs/instructions.md

@@ -284,10 +284,23 @@ Adapt code from `/home/lukas/Volume/repo/scraper/` to create tvshow.nfo files us
 
 ---
 
-#### Task 4: Add NFO Check to Download Flow
+#### Task 4: Add NFO Check to Download Flow ✅ **COMPLETE**
 
 **Priority:** High  
-**Estimated Time:** 2-3 hours
+**Estimated Time:** 2-3 hours  
+**Status:** Complete. See [task4_status.md](task4_status.md) for details.
+
+**What Was Completed:**
+
+-   ✅ NFO check integrated into download workflow
+-   ✅ Auto-create NFO and media files when missing
+-   ✅ Progress events for NFO operations (nfo_creating, nfo_completed, nfo_failed)
+-   ✅ Configuration settings respected
+-   ✅ Error handling (NFO failures don't block downloads)
+-   ✅ 11 comprehensive integration tests (all passing)
+-   ✅ No regression in existing tests
+
+**Remaining:** SerieScanner NFO status (deferred to later task)
 
 Integrate NFO checking into the download workflow - check for tvshow.nfo before downloading, create if missing.