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/bills_of_exchange.md

@@ -0,0 +1,30 @@
+---
+entity_slug: bills_of_exchange
+entity_type: Element
+vsm_system: S3
+type_rationale: Bills of exchange are written financial instruments that exist as
+  persistent artifacts in the commercial system, serving as tangible documents that
+  merchants can hold, transfer, and present for payment.
+vsm_rationale: Bills of exchange function primarily within the management system by
+  facilitating resource allocation and operational control, as banks discount these
+  instruments to allocate capital to merchants and manage the flow of commercial credit.
+classified_at: '2026-02-23T10:48:04.786650'
+---
+
+# Classification: Bills Of Exchange
+
+## Entity Type
+
+Element
+
+## VSM System
+
+S3
+
+## Type Rationale
+
+Bills of exchange are written financial instruments that exist as persistent artifacts in the commercial system, serving as tangible documents that merchants can hold, transfer, and present for payment.
+
+## VSM Rationale
+
+Bills of exchange function primarily within the management system by facilitating resource allocation and operational control, as banks discount these instruments to allocate capital to merchants and manage the flow of commercial credit.