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/monopoly_of_trade.md

@@ -0,0 +1,31 @@
+---
+entity_slug: monopoly_of_trade
+entity_type: Institution
+vsm_system: S5
+type_rationale: Monopoly of Trade represents a socially constructed rule system of
+  exclusive commercial privileges granted by government that creates artificial market
+  structures and governance over trade access.
+vsm_rationale: As government-granted exclusive privileges that fundamentally shape
+  the identity and purpose of the economic system by determining who can participate
+  in trade, monopolies operate at the policy level where ultimate authority decides
+  the basic rules of commercial engagement.
+classified_at: '2026-02-23T11:17:06.771886'
+---
+
+# Classification: Monopoly Of Trade
+
+## Entity Type
+
+Institution
+
+## VSM System
+
+S5
+
+## Type Rationale
+
+Monopoly of Trade represents a socially constructed rule system of exclusive commercial privileges granted by government that creates artificial market structures and governance over trade access.
+
+## VSM Rationale
+
+As government-granted exclusive privileges that fundamentally shape the identity and purpose of the economic system by determining who can participate in trade, monopolies operate at the policy level where ultimate authority decides the basic rules of commercial engagement.