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/mediterranean_civilisation_pattern.md

@@ -0,0 +1,32 @@
+---
+entity_slug: mediterranean_civilisation_pattern
+entity_type: Principle
+vsm_system: S4
+type_rationale: The Mediterranean Civilisation Pattern represents an abstract law
+  about how favorable geographical conditions for transportation systematically create
+  conditions for early economic development, specialization, and civilization across
+  different contexts.
+vsm_rationale: This pattern functions as intelligence about how environmental factors
+  enable economic adaptation and development, representing the kind of environmental
+  scanning and analysis that informs understanding of how civilizations emerge and
+  adapt to their geographical advantages.
+classified_at: '2026-02-23T11:14:48.862934'
+---
+
+# Classification: Mediterranean Civilisation Pattern
+
+## Entity Type
+
+Principle
+
+## VSM System
+
+S4
+
+## Type Rationale
+
+The Mediterranean Civilisation Pattern represents an abstract law about how favorable geographical conditions for transportation systematically create conditions for early economic development, specialization, and civilization across different contexts.
+
+## VSM Rationale
+
+This pattern functions as intelligence about how environmental factors enable economic adaptation and development, representing the kind of environmental scanning and analysis that informs understanding of how civilizations emerge and adapt to their geographical advantages.