feat(example): add L2 classifications for 823/988 WoN entities (S3.4)

Batch classification via OpenRouter (claude-sonnet-4). 165 entities
remain unclassified due to credit exhaustion; incremental skip means
a follow-up run will complete them automatically.

Type × VSM matrix (823 entities):
                  S1   S2   S3  S3*   S4   S5
  Element         86   75   58   21   43   32  (315 total, 38%)
  Process         39   42   37   17   67   24  (226 total, 28%)
  Institution      4   12   30   24    .   52  (122 total, 15%)
  Principle        3    7   15    2   43   32  (102 total, 12%)
  Relation         2   14    5    5   22   10   (58 total,  7%)
  Matrix fill: 29/30 cells (Institution/S4 empty — expected)

Metrics updated: type_entropy=2.0936, vsm_type_matrix_cells=29

Also:
- BatchEvaluator gains delay_seconds param for rate-limited providers
- classify CLI gains --rpm option (--rpm 10 for Gemini free tier)
- history.write_metrics_file now handles non-float metric values
  (type_distribution is a dict, was crashing round())
- run_entity_classification forwards delay_seconds to BatchEvaluator
- classify-links and graph commands added by user (entities --by-type,
  graph --format mermaid/dot, classify-links for Relation enrichment)

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

examples/infospace-with-history/output/classifications/economic_system_function.md

@@ -0,0 +1,31 @@
+---
+entity_slug: economic_system_function
+entity_type: Relation
+vsm_system: S5
+type_rationale: Economic System Function represents a structural dependency between
+  economic arrangements and their operational outcomes, serving as the causal link
+  that connects institutional structures to their practical effects in organizing
+  productive activity.
+vsm_rationale: This entity operates at the S5 level because it concerns the fundamental
+  purpose and identity of political economy systems, determining how different economic
+  arrangements achieve the ultimate objectives of political economy.
+classified_at: '2026-02-23T11:01:53.159389'
+---
+
+# Classification: Economic System Function
+
+## Entity Type
+
+Relation
+
+## VSM System
+
+S5
+
+## Type Rationale
+
+Economic System Function represents a structural dependency between economic arrangements and their operational outcomes, serving as the causal link that connects institutional structures to their practical effects in organizing productive activity.
+
+## VSM Rationale
+
+This entity operates at the S5 level because it concerns the fundamental purpose and identity of political economy systems, determining how different economic arrangements achieve the ultimate objectives of political economy.