docs: refresh engineering runbooks

[cursor]

Summary

• Updated engineering runbooks for the current event-loader contract and release workflow tag-existence gating.
• Corrected setup/configuration docs for explicit Prisma generation and the PRODUCTION=false MongoDB URI pitfall.
• Refreshed command/feature docs for /rank info, ticket setup/runtime behavior, Join-to-Create limitations, database URI selection, and current test coverage.

Codepaths Covered

• src/handlers/events.js and src/events/Guild/** event registration
• .github/workflows/release.yml release publishing flow
• package.json, src/example.config.js, and src/handlers/prisma.js setup/runtime config
• src/commands/slash/General/rank.js
• src/components/selects/ticketSSM.js, src/components/selects/ticket-menu.js, src/components/modals/ticket-modal.js, src/components/buttons/ticket-close.js
• src/commands/slash/Management/setup.js, src/components/selects/setupSSM.js, src/events/Guild/jointocreate.js, prisma/schema.prisma
• tests/*.test.js regression inventory

Key Knowledge Gaps Addressed

• Removed stale docs claiming Guild object event handlers do not match the event loader.
• Clarified releases are gated by missing v<package.version> tags, not latest-commit version-line diffs.
• Documented that Prisma client generation is explicit and no postinstall hook exists.
• Clarified that local PRODUCTION=false still selects MONGODB_URI for runtime MongoDB URI selection.
• Corrected /rank info to require a user and documented rank-card presence normalization.
• Documented current ticket setup/JTC limitations so operators do not expect unsupported automation.

Verification

• git diff --check
• npm test (37/37 passing)