feat(example): add baseline metrics snapshot from collection checks run

Initial metrics from S2.4 checks on 85 entities (7 of 35 chapters):
coverage_ratio=0.361, redundancy=0.0, coherence_components=0.0,
consistency_cycles=0.0, granularity_entropy=2.69

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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

@@ -0,0 +1,26 @@
+- 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

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

@@ -0,0 +1,6 @@
+coherence_components: 0.0
+consistency_cycles: 0.0
+coverage_ratio: 0.361111
+granularity_entropy: 2.687485
+modularity: 0.0
+redundancy_ratio: 0.0