dev-refactor

# Refactor Use for structural refactors. Use `dev-simplify` for local readability, dead code, or small logic cleanup. ## Rules - Preserve behavior and public contracts unless changes are explicit. - Classify first: small = local/no public movement; medium = multi-file/extraction/boundary/export touch; large = package/cross-package/staged migration/broad consumers. - For medium/large refactors, write a brief before editing: evidence, pressure, remaining delta, do/defer/avoid ranking, non-goals, contracts, target shape, validation, compatibility. - Do not propose target trees without current-code evidence: tree, file size/mixed concerns, imports/exports, consumers, validation commands. - Separate moves/renames from logic changes and design/API behavior questions. - Prefer existing conventions, provider locality, and the smallest structure that solves observed pressure. - Subtract before adding: remove dead wrappers, redundant validators, stale exports, and unused paths before introducing new structure. - Avoid taste refactors, premature abstractions, and thin one-file directories unless staged or conventional. - Validate with fresh command output. ## Workflow 1. Discover stack, configs, entry points, exact validation commands, and prior decisions when available. 2. Map contracts: exports, APIs, routes, CLI, config, schemas, events, files, docs, examples, consumers. 3. Map structure: directories, naming, boundaries, dependency direction, cycles, mixed concerns, duplication. 4. Check reader load: can a new reader find where key state comes from and what can change it quickly? Collapse pass-through layers that do not hide policy, adaptation, or real complexity. 5. If continuing work, compare current state and list only remaining delta. 6. Choose refactor type and shape: - extraction, reorganization, or design refactor - flat/internal, feature-first, domain-first, layer-first, core/adapters/entrypoints, service/repository - adapter-heavy: provider-specific stays provider-local; shared pure logic -> shared/core/formatting; SDK/client code -> adapter/entrypoint/delivery 7. Check boundary discipline: validate at CLI/config/network/external API edges; keep internal logic typed, domain-shaped, and pure where practical. 8. Prefer domain structure over repeated conditionals: state machine, typed model, registry/map, reducer, or ownership-focused module when it deletes branches or invalid states. 9. Rank moves as do now, defer, or avoid. 10. Stage: baseline (run `dev-smoke` on affected flows; keep the script until the last stage) -> delete dead paths -> move/rename -> imports/call sites -> split/merge -> simplify -> exports/docs/tests. 11. For internal API changes, inventory callers, migrate them, and delete the legacy API in the same wave when no external contract requires compatibility. 12. Preserve or explain compatibility re-exports/wrappers/barrels like `types.ts` plus `types/`. 13. Validate: tests, compile/typecheck, lint, build, `dev-smoke` rerun matching the baseline, diff review. ## Stop Pause when contracts are unclear, baseline cannot be checked and no narrower validation exists, breaking changes need migration decisions, ownership/product decisions are required, or the work is becoming a rewrite.