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_implementation_barrier.md

@@ -0,0 +1,31 @@
+---
+entity_slug: economic_system_implementation_barrier
+entity_type: Element
+vsm_system: S5
+type_rationale: Economic System Implementation Barrier represents a persistent obstacle
+  or difficulty that exists as an independent entity impeding economic arrangements,
+  rather than being a process, relationship, or abstract principle.
+vsm_rationale: Implementation barriers primarily operate at the policy level where
+  fundamental decisions about economic system identity and purpose are made, as they
+  determine whether intended economic policies and systems can be realized according
+  to their original design.
+classified_at: '2026-02-23T11:02:00.681113'
+---
+
+# Classification: Economic System Implementation Barrier
+
+## Entity Type
+
+Element
+
+## VSM System
+
+S5
+
+## Type Rationale
+
+Economic System Implementation Barrier represents a persistent obstacle or difficulty that exists as an independent entity impeding economic arrangements, rather than being a process, relationship, or abstract principle.
+
+## VSM Rationale
+
+Implementation barriers primarily operate at the policy level where fundamental decisions about economic system identity and purpose are made, as they determine whether intended economic policies and systems can be realized according to their original design.