WIP: stage all uncommitted work — sprints 46-221, graduation headers, specialist fleet, test steps 909-1988

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

example_projects/sql_etl_pipeline/PROJECT_META.md

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+# sql_etl_pipeline
+
+- stack: sql
+- validator: sqllogictest tests/*.slt
+- common_failure_modes: schema drift, non-idempotent transforms
+
+## Scope
+
+Small representative project for training data generation.