infospace: remove example output — will replay chapter by chapter

This commit clears the tangled example output so each chapter
can be re-committed cleanly via S3.2.

examples/infospace-with-history/output/metrics/history.yaml

@@ -1,26 +0,0 @@
-- snapshot_id: 6ba48eb2
-  created_at: '2026-02-19T01:29:41.225843+00:00'
-  schema_name: default
-  entity_count: 85
-  entity_evaluations: []
-  collection_metrics:
-  - name: coherence_components
-    value: 0.0
-    concern: C3
-  - name: consistency_cycles
-    value: 0.0
-    concern: C4
-  - name: coverage_ratio
-    value: 0.3611111111111111
-    concern: C2
-  - name: granularity_entropy
-    value: 2.687485267017996
-    concern: C5
-  - name: modularity
-    value: 0.0
-    concern: C3
-  - name: redundancy_ratio
-    value: 0.0
-    concern: C1
-  metadata:
-    source: collection-checks