# Complexity hotspots

Large and churn-heavy files are good places to look when planning refactors or targeted tests.

## Recent churn

| Path | Why it matters |
| --- | --- |
| `src-tauri/src/commands/ai/streaming_exec.rs` | Process execution, streaming, cancellation, and watchdog behavior changed often recently. |
| `frontend/src/app/useAppController.test.ts` | Central workflow tests changed often as app state behavior evolved. |
| `crates/qa-scribe-core/src/generation/html.rs` | Backend HTML handling is sensitive because it touches generated rich content. |
| `.github/workflows/release.yml` | Release automation has many packaging paths and platform cases. |

## Large source files

| Path | Notes |
| --- | --- |
| `scripts/build_apt_repository.py` | Largest script by line count. |
| `scripts/validate_linux_package_metadata.py` | Package metadata validation logic. |
| `.github/workflows/release.yml` | Largest CI workflow. |

Before changing these areas, read [Testing](how-to-contribute--testing.md) and run a focused check followed by `bun run verify:fast` or `bun run verify` depending on scope.