doxify: inject DOX framework into AGENTS.md and update system config docs
- Inject all 10 DOX sections into root AGENTS.md (Core Contract, Read Before
Editing, Update After Editing, Hierarchy, Child Doc Shape, Style, Closeout,
User Preferences, Child DOX Index)
- Update ADR 0002: linux612->linux618, 575xx->580xx NVIDIA migration
- Update setup.md: kernel/driver refs to current linux618 + 580xx
- Update stack.md, hardware-inventory.md: NVIDIA note 595.71->580xx
- Update manual-overrides.md: add br_vm_internal bridge deletion entry
- Update workstation-health.md: add Recent Cleanup section
- Update README.md: current software versions, expand roles list
- Add docs/neovim-cheatsheet.md
- Bump last_updated to 2026-06-17 on all modified docs
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