feat: add shell profiles for zsh, sh, csh/tcsh

- profile.bash: simplified preexec_init (early return), extracted
  ___keep_complete helper for @/@@ completion wrappers
- profile.zsh: add-zsh-hook preexec, wrapper function, @/@@ aliases,
  completions via compdef
- profile.sh: POSIX-compatible for sh/dash/ksh. Wrapper function,
  @/@@ aliases. No preexec or completions.
- profile.csh: alias-based keep wrapper, @/@@ aliases. No preexec
  or completions.
- modulefile: adds KEEP_SH_PROFILE, KEEP_ZSH_PROFILE, KEEP_CSH_PROFILE
- README: updated Shell Integration table and Shell Completion section

README.md

@@ -85,14 +85,24 @@ module load keep
 keep --status
 
 # Source the shell profile (optional, for shell integration)
-source $KEEP_BASH_PROFILE
+source $KEEP_BASH_PROFILE    # bash
+source $KEEP_ZSH_PROFILE     # zsh
+source $KEEP_SH_PROFILE      # sh/dash/ksh
+source $KEEP_CSH_PROFILE     # csh/tcsh
 ```
 
-The modulefile prepends `keep/bin` to `PATH` and sets `KEEP_BASH_PROFILE` pointing to `profile.bash`.
+The modulefile prepends `keep/bin` to `PATH` and sets shell-specific profile variables:
+
+| Variable | Profile | Shell |
+|----------|---------|-------|
+| `KEEP_BASH_PROFILE` | `profile.bash` | bash |
+| `KEEP_ZSH_PROFILE` | `profile.zsh` | zsh |
+| `KEEP_SH_PROFILE` | `profile.sh` | sh, dash, ksh93, pdksh, mksh |
+| `KEEP_CSH_PROFILE` | `profile.csh` | csh, tcsh |
 
 ### Shell Completion
 
-Tab completion is available for `bash`, `zsh`, `fish`, `elvish`, and `powershell`.
+Tab completion is available for `bash`, `zsh`, `fish`, `elvish`, and `powershell`. Completions for `@` (save) and `@@` (get) are available for `bash` and `zsh` only.
 
 **Bash** — add to `~/.bashrc`:
 
@@ -106,7 +116,7 @@ Tab completion is available for `bash`, `zsh`, `fish`, `elvish`, and `powershell
 . <(keep --generate-completion zsh)
 ```
 
-**With `profile.bash`**: Completions for `keep`, `@` (save), and `@@` (get) are loaded automatically when sourcing `profile.bash`.
+**With `profile.bash` or `profile.zsh`**: Completions for `keep`, `@` (save), and `@@` (get) are loaded automatically when sourcing the profile.
 
 ### Build with Server/Client Features
 
@@ -848,20 +858,41 @@ The server applies the following security measures:
 
 ## Shell Integration
 
-Source `profile.bash` to enable shell integration:
+Profile scripts are provided for several shells. Source the appropriate one to enable shell integration:
+
+| Profile | Shells | Features |
+|---------|--------|----------|
+| `profile.bash` | bash | Preexec hook, wrapper function, `@`/`@@` aliases, tab completions |
+| `profile.zsh` | zsh | Preexec hook, wrapper function, `@`/`@@` aliases, tab completions |
+| `profile.sh` | sh, dash, ksh93, pdksh, mksh | Wrapper function, `@`/`@@` aliases |
+| `profile.csh` | csh, tcsh | Alias-based `keep` wrapper, `@`/`@@` aliases |
 
 ```sh
+# bash
 source /path/to/keep/profile.bash
+
+# zsh
+source /path/to/keep/profile.zsh
+
+# sh, dash, ksh
+source /path/to/keep/profile.sh
+
+# csh/tcsh
+source /path/to/keep/profile.csh
 ```
 
-This provides:
+All profiles provide:
 
-- **`keep` function** — Captures the current command in metadata automatically
 - **`@` alias** — Shorthand for `keep --save`
 - **`@@` alias** — Shorthand for `keep --get`
 
+Bash and zsh profiles additionally provide:
+
+- **`keep` function** — Captures the current command in metadata automatically
+- **Tab completion** — For `keep`, `@`, and `@@`
+
 ```sh
-# Save with automatic command capture
+# Save with automatic command capture (bash/zsh)
 curl -s api.example.com | @ api-response
 
 # Quick retrieve

modulefile

@@ -15,3 +15,6 @@ module-whatis   Keep
 
 prepend-path    PATH             $mydir/bin
 setenv KEEP_BASH_PROFILE ${mydir}/profile.bash
+setenv KEEP_ZSH_PROFILE  ${mydir}/profile.zsh
+setenv KEEP_SH_PROFILE   ${mydir}/profile.sh
+setenv KEEP_CSH_PROFILE  ${mydir}/profile.csh

profile.bash

@@ -6,18 +6,10 @@ function __keep_preexec {
 }
 
 function __keep_preexec_init {
-  local found=false
-  local f
   for f in "${preexec_functions[@]}"; do
-    if [[ $f = __keep_preexec ]]; then
-      found=true
-      break
-    fi
+    [[ $f = __keep_preexec ]] && return
   done
-
-  if [[ $found = false ]]; then
-    preexec_functions+=(__keep_preexec)
-  fi
+  preexec_functions+=(__keep_preexec)
 }
 
 function keep {
@@ -43,17 +35,15 @@ function @@ {
 # Shell completions
 . <(command keep --generate-completion bash)
 
-___keep_save_completion() {
-    COMP_WORDS=(keep --save "${COMP_WORDS[@]:1}")
+___keep_complete() {
+    local mode="$1"
+    COMP_WORDS=(keep "$mode" "${COMP_WORDS[@]:1}")
     COMP_CWORD=$((COMP_CWORD + 1))
     _keep
 }
 
-___keep_get_completion() {
-    COMP_WORDS=(keep --get "${COMP_WORDS[@]:1}")
-    COMP_CWORD=$((COMP_CWORD + 1))
-    _keep
-}
+___keep_save_completion() { ___keep_complete --save; }
+___keep_get_completion() { ___keep_complete --get; }
 
 complete -F ___keep_save_completion @
 complete -F ___keep_get_completion @@

profile.csh

@@ -0,0 +1,11 @@
+#!/bin/csh
+# Profile for csh and tcsh.
+# Preexec hooks are not available; KEEP_META_command is not set.
+
+if ( ! $?KEEP_META_tty ) then
+  setenv KEEP_META_tty `tty`
+endif
+
+alias keep 'env KEEP_META_tty=${KEEP_META_tty} command keep \!*'
+alias @ 'keep --save \!*'
+alias @@ 'keep --get \!*'

profile.sh

@@ -0,0 +1,13 @@
+#!/bin/sh
+# POSIX-compatible profile for sh, dash, ksh93, pdksh, mksh, and other POSIX shells.
+# Preexec hooks are not available in these shells; KEEP_META_command is not set.
+
+KEEP_META_tty=${KEEP_META_tty:-$(tty)}
+
+keep() {
+  export KEEP_META_tty
+  command keep "$@"
+}
+
+alias @='keep --save'
+alias @@='keep --get'

profile.zsh

@@ -0,0 +1,38 @@
+#!/bin/zsh
+
+autoload -U add-zsh-hook
+
+__keep_preexec() {
+  KEEP_META_command="$1"
+  KEEP_META_tty=${KEEP_META_tty:-$(tty)}
+}
+
+add-zsh-hook preexec __keep_preexec
+
+keep() {
+  if [[ $ZSH_SUBSHELL -le 2 ]]; then
+    export KEEP_META_command
+  fi
+  export KEEP_META_tty
+  command keep "$@"
+}
+
+alias @='keep --save'
+alias @@='keep --get'
+
+# Shell completions
+. <(command keep --generate-completion zsh)
+
+___keep_complete() {
+    local mode="$1"
+    local -a words
+    words=(keep "$mode" "${words[@]:1}")
+    ((CURRENT++))
+    _keep
+}
+
+___keep_save_completion() { ___keep_complete --save; }
+___keep_get_completion() { ___keep_complete --get; }
+
+compdef ___keep_save_completion @
+compdef ___keep_get_completion @@