Semantic layer overhaul: make every documented feature real#1

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fix/semantic-layer-overhaul

Jun 1, 2026

Commits on Jun 1, 2026

feat(semantic): nested MetricFlow YAML schema + domain errors
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feat(semantic): SemanticCompiler for 4 metric types + runtime bind
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feat(semantic): sqlglot publish-time firewall + RFC7807 400 mapping
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feat(semantic): 0014 migration + entities/DTOs for metadata_json, dimension_type, aliases
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feat(semantic): repository + service correctness (get_by_name, versioning, recompile, dimensions)
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fix(query): execute SEMANTIC_LAYER compiled SQL (the dead fast-path)
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feat(web): agent-tier semantic/glossary mirror controllers
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docs+openapi: reconcile semantic-layer docs; regenerate openapi.json
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style: ruff format the new semantic-layer modules + tests
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Release 26.6.0
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