test: add scenario eval runner, recorded fixtures, and baseline comparison

eval/scenarios.yaml

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+version: 1
+scenarios:
+  - key: focus-coding
+    chip: Focus while coding
+    query: something calm for while I am programming, but not boring
+    facets:
+      activity: coding
+      familiarity: mix
+  - key: workout-energy
+    chip: Energy for the gym
+    query: high-energy music for a heavy workout
+    facets:
+      activity: workout
+      mood: energetic
+  - key: dutch-chill
+    chip: Dutch and relaxed
+    query: relaxed Dutch-language music for the couch
+    facets:
+      language: nl
+      mood: relaxed
+  - key: nineties-nostalgia
+    chip: 90s nostalgia
+    query: take me back to the nineties
+    facets:
+      era: 1990s
+  - key: discover-new
+    chip: Surprise me with something new
+    query: something I do not know yet but will probably like
+    facets:
+      familiarity: new
+  - key: rainy-sunday
+    chip: Rainy Sunday
+    query: melancholic but warm, for a rainy Sunday morning
+    facets:
+      mood: melancholic
+  - key: dinner-background
+    chip: Background for dinner
+    query: something jazzy for during dinner, not too present
+    facets:
+      genre: jazz
+      mood: subdued
+  - key: focus-coding-refine
+    chip: More electronic
+    query: a bit more electronic, and drop number 3
+    after: focus-coding
+    facets:
+      refinement: true
+      pool_reuse: true
+      re_grounding: false