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_best_practice.md

@@ -0,0 +1,32 @@
+---
+entity_slug: economic_system_best_practice
+entity_type: Principle
+vsm_system: S5
+type_rationale: Economic System Best Practice represents an abstract theoretical claim
+  about what constitutes optimal economic arrangements and methods, functioning as
+  a rule or standard that holds across different contexts rather than being a specific
+  entity, process, or institution.
+vsm_rationale: This entity operates at the highest level of political economy by establishing
+  the fundamental purposes and identity of what constitutes effective economic systems,
+  which is the core function of S5 as the ultimate authority defining system purpose
+  and values.
+classified_at: '2026-02-23T11:00:42.739697'
+---
+
+# Classification: Economic System Best Practice
+
+## Entity Type
+
+Principle
+
+## VSM System
+
+S5
+
+## Type Rationale
+
+Economic System Best Practice represents an abstract theoretical claim about what constitutes optimal economic arrangements and methods, functioning as a rule or standard that holds across different contexts rather than being a specific entity, process, or institution.
+
+## VSM Rationale
+
+This entity operates at the highest level of political economy by establishing the fundamental purposes and identity of what constitutes effective economic systems, which is the core function of S5 as the ultimate authority defining system purpose and values.