docs: record the LazyVim profile and the auto-speak arming rule (Refs #36)

Neither setting did what it looked like it did, and the knowledge base had no
page for either, so both were invisible until the operator asked.

tools/neovim.md: the two entry points (vanilla `nvim`, `lazyvim` as an
NVIM_APPNAME profile), the fresh-box install, the base16 wallpaper-palette hook
with its SIGUSR1 contract, and the trap that matters — the official recipe
clones over ~/.config/nvim and destroys the vanilla quick-edit path.
tools/applications.md gets the editor row (Ghostty's row had lost its label)
and Neovim's verified version.

core/dankvoice.md gains the arming rule: arming is session-scoped, a silent
session start is a config state, and the two checks — `/say status` then
`pgrep -a pw-play` — prove the chain without blaming the endpoint.

kb-lint 0 violations, index-coverage 0 issues.

omp-docs/tools/index.md

@@ -15,6 +15,7 @@ Configuration guides and reference material for installed software. Each tool ha
 * [live-sync](live-sync.md) — Heartbeat daemon committing machine-written paths (memories, managed-skills, live config, dotfiles) in the command-center checkout; systemd user timer, alerts via ntfy.
 * [llama.cpp](llama-cpp/index.md) — Local LLM inference server supporting GGUF models with OpenAI-compatible API.
 * [linux-power-management](linux-power-management.md) — Sleep/wake troubleshooting, NVIDIA GPU power management, and diagnostics for Linux systems.
+* [neovim](neovim.md) — Two editors in one binary: vanilla `nvim` for quick edits and the `lazyvim` NVIM_APPNAME profile, with the base16 wallpaper-palette hook and fresh-box install.
 * [niri](niri/index.md) — Scrollable-tiling Wayland compositor — configuration, keybindings, and architecture for the workstation.
 * [noctalia-shell](noctalia-shell.md) — Native desktop environment for Niri — launcher, control center, settings, lock screen, session menu, hotkey overlay, media controls, and system management.
 * [tmux](tmux.md) — Terminal multiplexer configuration, extended-keys setup, keyboard input best practices, and reload/restart procedures.