Adds the new shared-types stage system prompt for the runner exporter
pipeline (rules for emitting enum files plus PaginatedResponse and
ListQueryParams under server/src/enums and server/src/shared).
Updates backend-rules.md with the iterative fixes that accumulated in
the runner during recent generation runs: composite key Prisma syntax,
auth import paths under guards/decorators subfolders, Prisma relation
connect syntax for FK writes, dynamic sort type assertion, and an
initial Shared Enum Files section that the next prompt task will
replace with a Shared Types section pointing at the new shared-types
zone.
These prompts are the source of truth for runner/toir-fullstack-exporter
which copies them in via scripts/sync-context.mjs at build time.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
