feat: Add fast startup fetch and background caching

- Add  for quick startup using first N feeds
- Add background thread for full fetch and caching
- Update  to use fast fetch
- Update docs and skills

engine/app/pipeline_runner.py

@@ -8,7 +8,7 @@ from typing import Any
 
 from engine.display import BorderMode, DisplayRegistry
 from engine.effects import get_registry
-from engine.fetch import fetch_all, fetch_poetry, load_cache
+from engine.fetch import fetch_all, fetch_all_fast, fetch_poetry, load_cache, save_cache
 from engine.pipeline import Pipeline, PipelineConfig, PipelineContext, get_preset
 from engine.pipeline.adapters import (
     EffectPluginStage,
@@ -138,14 +138,7 @@ def run_pipeline_mode(preset_name: str = "demo"):
                 print("Error: Invalid viewport format. Use WxH (e.g., 40x15)")
                 sys.exit(1)
 
-    pipeline = Pipeline(
-        config=PipelineConfig(
-            source=preset.source,
-            display=preset.display,
-            camera=preset.camera,
-            effects=preset.effects,
-        )
-    )
+    pipeline = Pipeline(config=preset.to_config())
 
     print("  \033[38;5;245mFetching content...\033[0m")
 
@@ -167,10 +160,24 @@ def run_pipeline_mode(preset_name: str = "demo"):
         cached = load_cache()
         if cached:
             items = cached
+            print(f"  \033[38;5;82mLoaded {len(items)} items from cache\033[0m")
         elif preset.source == "poetry":
             items, _, _ = fetch_poetry()
         else:
-            items, _, _ = fetch_all()
+            items = fetch_all_fast()
+            if items:
+                print(
+                    f"  \033[38;5;82mFast start: {len(items)} items from first 5 sources\033[0m"
+                )
+
+            import threading
+
+            def background_fetch():
+                full_items, _, _ = fetch_all()
+                save_cache(full_items)
+
+            background_thread = threading.Thread(target=background_fetch, daemon=True)
+            background_thread.start()
 
         if not items:
             print("  \033[38;5;196mNo content available\033[0m")