Merge 44ade697bf into a0c9dbe80b

iTerm2 3.7.0 added receiver support for the OSC 133 k= attribute
(Semantic Prompt prompt kinds: k=i initial, k=s secondary/PS2,
k=c continuation, k=r right). When emitted by the shell, iTerm2
records the bracketed cells as non-input on the active primary
prompt mark, so consumers (Select Current Command, share-as-URL,
AI prompt extraction, the Python GetPromptResponse.excluded_subranges
field) can subtract them from the typed-command range.

Two gaps for iTerm2 today:

1. The RPROMPT k=r wrap in _p9k_init_prompt is gated to WarpTerminal.
   iTerm2 sessions never trip the gate, so right-prompt cells leak
   into "Select Current Command", share URLs, etc.

2. p10k replaces iTerm2's iterm2_decorate_prompt with a stub that
   only records ITERM2_PRECMD_PS1. iTerm2's original function also
   wraps PS2 with OSC 133; the stub drops that wrap entirely, so
   multi-line input (for, while, unclosed quotes, heredocs, backslash
   continuations) produces no k=s markers and iTerm2 has no way to
   tell PS2-prefix cells apart from user input.

Both fixes are gated on iTerm2 >= 3.7.0 via
TERM_PROGRAM_VERSION == (3.<7->*|<4->.*). Older iTerm2 receivers do
not parse k= and would treat k=r/k=s markers as spurious primary
prompts (extra navigation marks, broken command-range tracking,
broken paste-each-line semantics). WarpTerminal behavior is
unchanged. The ITERM2_SQUELCH_PS2_MARK opt-out from iTerm2's
original iterm2_decorate_prompt is preserved.

internal/p10k.zsh

@@ -8399,14 +8399,16 @@ _p9k_init_prompt() {
   if (( _POWERLEVEL9K_TERM_SHELL_INTEGRATION )); then
     _p9k_prompt_prefix_left+=$'%{\e]133;A\a%}'
     _p9k_prompt_suffix_left+=$'%{\e]133;B\a%}'
-    if [[ $TERM_PROGRAM == WarpTerminal ]]; then
+    if [[ $TERM_PROGRAM == WarpTerminal ||
+          ( $TERM_PROGRAM == iTerm.app && $TERM_PROGRAM_VERSION == (3.<7->*|<4->.*) ) ]]; then
       _p9k_prompt_prefix_right=$'%{\e]133;P;k=r\a%}'$_p9k_prompt_prefix_right
       _p9k_prompt_suffix_right+=$'%{\e]133;B\a%}'
     fi
     if (( $+_z4h_iterm_cmd && _z4h_can_save_restore_screen == 1 )); then
       _p9k_prompt_prefix_left+=$'%{\ePtmux;\e\e]133;A\a\e\\%}'
       _p9k_prompt_suffix_left+=$'%{\ePtmux;\e\e]133;B\a\e\\%}'
-      if [[ $TERM_PROGRAM == WarpTerminal ]]; then
+      if [[ $TERM_PROGRAM == WarpTerminal ||
+            ( $TERM_PROGRAM == iTerm.app && $TERM_PROGRAM_VERSION == (3.<7->*|<4->.*) ) ]]; then
         _p9k_prompt_prefix_right=$'%{\ePtmux;\e\e]133;P;k=r\a\e\\%}'$_p9k_prompt_prefix_right
         _p9k_prompt_suffix_right+=$'%{\ePtmux;\e\e]133;B\a\e\\%}'
       fi
@@ -8496,7 +8498,8 @@ _p9k_init_ssh() {
 
   # When changing user on a remote system, the $SSH_CONNECTION environment variable can be lost.
   # Attempt detection via `who`.
-  (( $+commands[who] )) || return
+  [[ -z "$(command -v who)" ]] && return
+  #(( $+commands[who] )) || return
 
   local ipv6='(([0-9a-fA-F]+:)|:){2,}[0-9a-fA-F]+'  # Simplified, only checks partial pattern.
   local ipv4='([0-9]{1,3}\.){3}[0-9]+'              # Simplified, allows invalid ranges.
@@ -8965,6 +8968,11 @@ _p9k_init() {
     function iterm2_decorate_prompt() {
       typeset -g ITERM2_PRECMD_PS1=$PROMPT
       typeset -g ITERM2_SHOULD_DECORATE_PROMPT=
+      if [[ -n $PS2 && $PS2 != *$'\e]133;A;k=s\a'* && -z ${ITERM2_SQUELCH_PS2_MARK-} &&
+            $TERM_PROGRAM_VERSION == (3.<7->*|<4->.*) ]]; then
+        typeset -g ITERM2_PRECMD_PS2=$PS2
+        PS2=$'%{\e]133;A;k=s\a%}'$PS2$'%{\e]133;B\a%}'
+      fi
     }
   fi
   if (( $+functions[iterm2_precmd] )); then
@@ -9512,7 +9520,7 @@ if [[ $__p9k_dump_file != $__p9k_instant_prompt_dump_file && -n $__p9k_instant_p
   zf_rm -f -- $__p9k_instant_prompt_dump_file{,.zwc} 2>/dev/null
 fi
 
-typeset -g P9K_VERSION=1.20.15
+typeset -g P9K_VERSION=1.20.16
 
 if [[ ${VSCODE_SHELL_INTEGRATION-} == <1-> && ${+__p9k_force_term_shell_integration} == 0 ]]; then
   typeset -gri __p9k_force_term_shell_integration=1