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/mutual_gain_reciprocity.md

@@ -0,0 +1,30 @@
+---
+entity_slug: mutual_gain_reciprocity
+entity_type: Principle
+vsm_system: S4
+type_rationale: Mutual Gain Reciprocity is an abstract economic law that holds across
+  contexts, demonstrating how commercial exchange creates net gains for all participants
+  rather than zero-sum outcomes.
+vsm_rationale: This principle operates as intelligence about how economic systems
+  adapt and function, providing insight into the environmental dynamics that allow
+  specialization and trade to create mutual benefits rather than competitive losses.
+classified_at: '2026-02-23T11:17:13.323789'
+---
+
+# Classification: Mutual Gain Reciprocity
+
+## Entity Type
+
+Principle
+
+## VSM System
+
+S4
+
+## Type Rationale
+
+Mutual Gain Reciprocity is an abstract economic law that holds across contexts, demonstrating how commercial exchange creates net gains for all participants rather than zero-sum outcomes.
+
+## VSM Rationale
+
+This principle operates as intelligence about how economic systems adapt and function, providing insight into the environmental dynamics that allow specialization and trade to create mutual benefits rather than competitive losses.