feat(gateway): run the full fast gate (incl. complexity) at the dev's desk

Add a per-project `quality_command` (model + ORM + API + panel + migration 029)
that the pre-submit gate prefers over the lint/typecheck pair. Pointed at the new
`make gate` target (ruff format --check + ruff check + mypy + xenon, no tests),
i_am_done now catches lint, type AND complexity failures in the developer's
workspace before QA — closing the gap where over-complex code only failed in CI.
Falls back to lint+typecheck when unset; a no-op when no commands are configured.

panel/src/lib/api/projects.ts

@@ -83,6 +83,7 @@ export const projectsApi = {
         format_command: project.format_command ?? null,
         typecheck_command: project.typecheck_command ?? null,
         build_command: project.build_command ?? null,
+        quality_command: project.quality_command ?? null,
         workspace_path: null,
         last_synced_at: null,
         head_commit: null,