feat(trace): standardize StageTrace (add summary) and coerce duration_ms to int at API boundary

test-mode: stub runner in router; factory stubs accept positional calls

fix(router): lazy pipeline build for pytest; fix(factory): stubs accept positional/keyword args

refactor(core): DI-ready Pipeline; add registry + YAML factory + typed trace/result

refactor(core): DI-ready Pipeline; add registry + YAML factory + typed trace/result

fix(router): coerce trace.duration_ms to int in response (_round_trace)

refactor(router): inject pipeline via Depends(get_runner); preserve error dump logging

test(router): use _RUN hook to fake pipeline.run in router tests

test(router): monkeypatch _pipeline.run instead of nl2sql.Pipeline.run

fix(router): re-export Pipeline via alias to satisfy test monkeypatch; remove duplicate import

fix(router): avoid Pipeline redefinition; expose Pipeline via import for test monkeypatch

fix(types): avoid mypy no-redef in nl2sql_handler by predeclaring pipeline_obj

fix(api): map FinalResult → HTTP (200/400) and stabilize nl2sql handler; prevent 500s in tests

fix(api): map FinalResult → HTTP (200/400) and stabilize nl2sql handler; prevent 500s in tests

fix(typing): split adapter vars in /readyz to satisfy mypy

fix(api): make adapter non-optional within branch and annotate pipeline for mypy

fix(router): make final_preview assignment mypy-safe (ensure always str)

fix(router): make _db type-safe and clean up nl2sql_handler preview logic

tests green: fix pipeline reference in router and adjust verifier logic for aggregation & error handling

fix(mypy): add types-requests, validate numeric inputs, enforce non-null schema_preview

fix(pipeline): align backend-frontend schema and stabilize SQL flow

style: format code with ruff

feat(demo): add initial Gradio UI with optional SQLite upload

tests: fix import-time KeyError by ensuring OPENAI_ in conftest and lazy-import router in test_ambiguity

build(mypy): fix type errors and add safety guards for None values

style: format code with ruff

refactor: unify pipeline output via FinalResult model

style: format code with ruff

init: NL2SQL Copilot base with API and Dockerfile