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/engrossers_and_forestallers.md

@@ -0,0 +1,30 @@
+---
+entity_slug: engrossers_and_forestallers
+entity_type: Institution
+vsm_system: S3*
+type_rationale: Engrossers and forestallers represent a formal regulatory system with
+  specific rules prohibiting certain market behaviors, making them a socially constructed
+  governance structure rather than mere principles or processes.
+vsm_rationale: These regulations function as audit and compliance mechanisms designed
+  to inspect and control merchant behavior to ensure adherence to medieval market
+  rules, even though Smith argues they undermine rather than support market integrity.
+classified_at: '2026-02-23T11:04:31.640772'
+---
+
+# Classification: Engrossers And Forestallers
+
+## Entity Type
+
+Institution
+
+## VSM System
+
+S3*
+
+## Type Rationale
+
+Engrossers and forestallers represent a formal regulatory system with specific rules prohibiting certain market behaviors, making them a socially constructed governance structure rather than mere principles or processes.
+
+## VSM Rationale
+
+These regulations function as audit and compliance mechanisms designed to inspect and control merchant behavior to ensure adherence to medieval market rules, even though Smith argues they undermine rather than support market integrity.