Fix reset: pull starter from SECTION_TEMPLATES, not the DB row

Signup page

Login page

Sections + shared done-detection (adds isSectionDone used by pages)

Spec editor page: per-section editing, autosave, preview, markdown export

Vite client types reference

Minimalist UI styles

Server queries: getSpecs, getSpec

The 12 harness-ready sections with hints and starters

Server actions: create/update/reset/delete

Specs list page: create, progress, open