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

docs/neovim-cheatsheet.md

@@ -0,0 +1,64 @@
+---
+title: "Neovim v0.12.2 Cheatsheet"
+author: "mw-pfeddersheim-workstation"
+date: "June 2026"
+---
+
+# Neovim Cheatsheet
+
+**Version:** v0.12.2 (LuaJIT 2.1) **Config:** `~/.config/nvim/init.lua`
+
+## Search
+
+### Buffer Search (current file)
+
+| Command | Action |
+|---------|--------|
+| `/pattern` | Search forward |
+| `?pattern` | Search backward |
+| `n` | Next match (forward) |
+| `N` | Previous match (backward) |
+
+### File Search (across files)
+
+| Command | Action |
+|---------|--------|
+| `:grep pattern` | Search current directory with ripgrep |
+| `:grep pattern /path/to/dir` | Search specific directory |
+| `:cfirst` | Jump to first match |
+| `:cnext` / `:cprev` | Next / previous match |
+| `:copen` | Open quickfix window with all results |
+| `:cclose` | Close quickfix window |
+
+## Editing
+
+| Command | Action |
+|---------|--------|
+| `D` | Delete from cursor to end of line |
+| `d$` | Delete to end of line (same as `D`) |
+| `dd` | Delete entire line |
+| `C` | Change from cursor to end of line (delete + insert mode) |
+
+## Text Objects
+
+Delete or operate on structured text by type:
+
+| Command | Action |
+|---------|--------|
+| `di{` | Delete **inside** `{}` (keeps braces) |
+| `da{` | Delete **a** `{}` (removes braces too) |
+| `di"` | Delete inside double quotes |
+| `da"` | Delete a double-quoted section |
+| `di(` | Delete inside parentheses |
+| `da(` | Delete a parenthesized section |
+| `di[` | Delete inside brackets |
+| `da[` | Delete a bracketed section |
+| `di<` | Delete inside angle brackets |
+| `da<` | Delete an angle-bracketed section |
+
+**Pattern:** `d` (delete) + `i` (inside) / `a` (around) + `{type}`
+
+**Also works with:**
+- `v` + text object — select (e.g. `vi{` selects inside braces)
+- `y` + text object — yank/copy (e.g. `ya{` copies including braces)
+- `c` + text object — change (e.g. `ci{` deletes + enters insert mode)