Installs the zsh package and makes it the operator account's login shell through the user shape. The host gives the found shell back when the module goes.
Claims the mesh's node-login-shell seat and serves its verb execute: one command, run as the account in a zsh login shell in the account's home. It is ended with everything it started after 20 s by default (25 s at most, below the runtime's 30 s call limit). Each stream is cut at 256 KiB and the answer says so in truncated.
Its own tool zsh_config shows ~/.zshenv and ~/.zshrc as they are, with the mesh block's line count in each.
Contributes to the account's environment (ADR 0203): EDITOR and VISUAL (vim), XDG_CONFIG_HOME, and ~/.local/bin, ~/scripts, ~/scripts/bin at the start of PATH. The holder of node-environment (node-env) writes them; this module writes no export of its own.

The two blocks

Each block is the mesh's, between # BEGIN mesh zsh.<id> and # END mesh zsh.<id>. Every line outside a block is yours, kept byte for byte, and given back when the module goes.

~/.zshenv, at the start: sources ~/.config/mesh/environment.sh if it is readable. Every zsh reads this file: a login, a script, and execute.
~/.zshrc, at the start: the defaults every machine shares, with the three slots other modules fill (first, the defaults, normal, last). The defaults are the terminal title, seven keybindings, the colour aliases, ll/la/l, drun, disksize and sudo-disksize. Your lines below it run after it, so they win.

The one-off migration (ADR 0182)

The mesh removes nothing it did not make. After the first push that assigns this module, the lines below are in the block and in your own part of ~/.zshrc. Until you delete your copies, they run twice, which is harmless and visible. Deleting them is a person's act, once per machine.

Delete once zsh is assigned. The block or the environment now carries these:

export EDITOR=vim
export VISUAL=vim
export XDG_CONFIG_HOME=$HOME/.config
export PATH="$HOME/.local/bin:$HOME/scripts:$HOME/scripts/bin:$HOME/.dotnet:$PATH". Keep the one entry no module carries yet, as export PATH="$HOME/.dotnet:$PATH".
The terminal title: function set_terminal_title() { … } and precmd_functions+=(set_terminal_title).
The seven bindkey lines (Home twice, Ctrl+A, End twice, Ctrl+E, Del).
alias drun='docker run -it --rm', and the functions disksize() { … } and sudo-disksize() { … }.
The if [ -x /usr/bin/dircolors ]; then … fi block, with its aliases ls, dir, vdir, grep, fgrep and egrep.
alias ll='ls -alhF', alias la='ls -Ah' and alias l='ls -CFh'.

Delete once powerlevel10k is assigned. Its contribution in the normal slot loads the prompt:

#user_p10k_cache_file="${XDG_CACHE_HOME:-$HOME/.cache}/p10k-instant-prompt-${USER}.zsh", and the if [[ -r "$user_p10k_cache_file" ]]; then … fi after it. It does nothing today, because the variable is commented out.
[[ ! -f ~/.zsh/themes/powerlevel10k/powerlevel10k.zsh-theme ]] || source …
[[ ! -f ~/.p10k.zsh ]] || source ~/.p10k.zsh

Delete once zsh-autosuggestions / zsh-syntax-highlighting are assigned. Each module loads the distribution's copy from its own slot:

[[ ! -f ~/.zsh/plugins/zsh-autosuggestions/zsh-autosuggestions.zsh ]] || source …
[[ ! -f ~/.zsh/plugins/zsh-syntax-highlighting/zsh-syntax-highlighting.zsh ]] || source …

What stays yours. Keep these below the block until a module carries them:

the NVM_DIR lines;
MY_KV_PATH and MY_LIB_PATH;
CLAUDE_CODE_DISABLE_TERMINAL_TITLE;
the killport and findport aliases;
the zstyle lines;
the line sourcing ~/.zshrc.local, and that file itself.

Paths no longer used. The predecessor cloned these and nothing of the mesh reads them. Remove them by hand once the module that replaces each is assigned:

~/.zsh/themes/powerlevel10k: replaced by powerlevel10k's pinned copy in ~/.local/share/powerlevel10k;
~/.p10k.zsh: replaced by ~/.config/powerlevel10k/p10k.zsh, the same bytes, once powerlevel10k is assigned;
~/.zsh/plugins/zsh-autosuggestions and ~/.zsh/plugins/zsh-syntax-highlighting: replaced by the distribution's packages;
~/.zsh/plugins/zsh-autocomplete: loaded by nothing today.

Anything else under ~/.zsh/ is yours.