refactor(shell): Rename environment variables from Q_ to KIRO_ prefix

Replace all Q_ prefixed environment variables with KIRO_ prefix across
shell integration files for rebranding. This includes:

- Shell script variables (Q_SHELL, Q_PARENT, Q_TERM, etc.)
- Autosuggest configuration variables (Q_AUTOSUGGEST_* to KIRO_AUTOSUGGEST_*)
- Prompt variables (Q_USER_PS1, Q_LAST_PS1, etc.)
- Internal state variables (Q_HAS_SET_PROMPT, Q_IS_LOGIN_SHELL, etc.)

Changes affect:
- All inline shell completion zsh files
- Shell integration scripts for bash, fish, and zsh
- Both pre and post shell hook scripts
- Legacy comment descriptions updated from CodeWhisperer to Kiro

Also removed stale analysis and todo files.

🤖 Assisted by Amazon Q Developer

Author: dk19y

.amazonq/cli-todo-lists/1761593302615.json

@@ -0,0 +1 @@
+{"tasks":[{"task_description":"Update post.zsh script Q_ variables to KIRO_","completed":true},{"task_description":"Update post.bash script Q_ variables to KIRO_","completed":true},{"task_description":"Update pre.sh script Q_ variables to KIRO_","completed":true},{"task_description":"Update inline shell completion config.zsh Q_AUTOSUGGEST variables","completed":true},{"task_description":"Update remaining inline shell completion .zsh files","completed":true}],"description":"Update shell integration files from Q_ to KIRO_ environment variables","context":["Updated post.zsh script to use KIRO_ prefixed environment variables instead of Q_ prefixed ones","Updated post.bash script to use KIRO_ prefixed environment variables instead of Q_ prefixed ones","Updated pre.sh script to use KIRO_ prefixed environment variables instead of Q_ prefixed ones","Updated config.zsh to use KIRO_AUTOSUGGEST variables instead of Q_AUTOSUGGEST","Updated all remaining inline shell completion .zsh files to use KIRO_AUTOSUGGEST variables instead of Q_AUTOSUGGEST"],"modified_files":["crates/fig_integrations/src/shell/scripts/post.zsh","crates/fig_integrations/src/shell/scripts/post.bash","crates/fig_integrations/src/shell/scripts/pre.sh","crates/fig_integrations/src/shell/inline_shell_completion/config.zsh","crates/fig_integrations/src/shell/inline_shell_completion/*.zsh"],"id":"1761667777935"}

.amazonq/cli-todo-lists/1761667777935.json

@@ -6,33 +6,33 @@
 _q_autosuggest_async_request() {
 	zmodload zsh/system 2>/dev/null # For `$sysparams`
 
-	typeset -g _Q_AUTOSUGGEST_ASYNC_FD _Q_AUTOSUGGEST_CHILD_PID
+	typeset -g _KIRO_AUTOSUGGEST_ASYNC_FD _KIRO_AUTOSUGGEST_CHILD_PID
 
 	# If we've got a pending request, cancel it
-	if [[ -n "$_Q_AUTOSUGGEST_ASYNC_FD" ]] && { true <&$_Q_AUTOSUGGEST_ASYNC_FD } 2>/dev/null; then
+	if [[ -n "$_KIRO_AUTOSUGGEST_ASYNC_FD" ]] && { true <&$_KIRO_AUTOSUGGEST_ASYNC_FD } 2>/dev/null; then
 		# Close the file descriptor and remove the handler
-		exec {_Q_AUTOSUGGEST_ASYNC_FD}<&-
-		zle -F $_Q_AUTOSUGGEST_ASYNC_FD
+		exec {_KIRO_AUTOSUGGEST_ASYNC_FD}<&-
+		zle -F $_KIRO_AUTOSUGGEST_ASYNC_FD
 
 		# We won't know the pid unless the user has zsh/system module installed
-		if [[ -n "$_Q_AUTOSUGGEST_CHILD_PID" ]]; then
+		if [[ -n "$_KIRO_AUTOSUGGEST_CHILD_PID" ]]; then
 			# Zsh will make a new process group for the child process only if job
 			# control is enabled (MONITOR option)
 			if [[ -o MONITOR ]]; then
 				# Send the signal to the process group to kill any processes that may
 				# have been forked by the suggestion strategy
-				kill -TERM -$_Q_AUTOSUGGEST_CHILD_PID 2>/dev/null
+				kill -TERM -$_KIRO_AUTOSUGGEST_CHILD_PID 2>/dev/null
 			else
 				# Kill just the child process since it wasn't placed in a new process
 				# group. If the suggestion strategy forked any child processes they may
 				# be orphaned and left behind.
-				kill -TERM $_Q_AUTOSUGGEST_CHILD_PID 2>/dev/null
+				kill -TERM $_KIRO_AUTOSUGGEST_CHILD_PID 2>/dev/null
 			fi
 		fi
 	fi
 
 	# Fork a process to fetch a suggestion and open a pipe to read from it
-	exec {_Q_AUTOSUGGEST_ASYNC_FD}< <(
+	exec {_KIRO_AUTOSUGGEST_ASYNC_FD}< <(
 		# Tell parent process our pid
 		echo $sysparams[pid]
 
@@ -48,10 +48,10 @@ _q_autosuggest_async_request() {
 	is-at-least 5.8 || command true
 
 	# Read the pid from the child process
-	read _Q_AUTOSUGGEST_CHILD_PID <&$_Q_AUTOSUGGEST_ASYNC_FD
+	read _KIRO_AUTOSUGGEST_CHILD_PID <&$_KIRO_AUTOSUGGEST_ASYNC_FD
 
 	# When the fd is readable, call the response handler
-	zle -F "$_Q_AUTOSUGGEST_ASYNC_FD" _q_autosuggest_async_response
+	zle -F "$_KIRO_AUTOSUGGEST_ASYNC_FD" _q_autosuggest_async_response
 }
 
 # Called when new data is ready to be read from the pipe