feat: add Phase 2 shadow runtime dual-run scaffolding#105
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Implement internal shadow planner comparisons for query and DDL paths, add deterministic shadow report fixtures with backend-matrix enforcement, and synchronize roadmap/migration guide evidence for IR Phase 2 issues. Co-authored-by: Cursor <cursoragent@cursor.com>
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This was referenced Jun 19, 2026
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Jun 19, 2026
Update roadmap status, Phase 2 deliverables/exit gates, and merged evidence after PR #105, with linked issue-sync references for the closed Phase 2 epic and sub-issues. Co-authored-by: Cursor <cursoragent@cursor.com>
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Summary
add internal shadow-runtime dual-run scaffolding for query and DDL planning with execute-legacy-only behavior and strict mismatch mode for CI
introduce deterministic semantic diff/report harnesses plus stable SQLite/Postgres shadow report fixtures
enforce touched-path PR gating for shadow reports in CI and synchronize Phase 2 roadmap/migration-guide evidence
closes [IR-P2][WS2] Phase 2 Shadow runtime dual-run (epic) #80
closes [IR-P2][WS2] Add shadow planner behind internal flag #81
closes [IR-P2][WS2] Build semantic diff harness #82
closes [IR-P2][WS2] Add backend matrix shadow reports #83
Test plan
uv run pytest -v -m "backend_matrix or postgres_only" --db-backends=sqlite,postgrescargo test --no-default-features --features testinguv run pytest tests/test_shadow_reports.py tests/test_ir_vectors_contract.py -q --db-backends=sqlite,postgresMade with Cursor