fix: export COMPLETE and _COMPLETE_INDEX env vars in bash/zsh completion hooks

The bash and zsh registration scripts set COMPLETE and _COMPLETE_INDEX
as shell variables inside $(...) subshells, but never export them.
This means the CLI binary does not see them in process.env, falls
through to normal arg parsing, and errors on the -- separator.

Fish and nushell are unaffected because they use inline prefix
syntax (COMPLETE=fish cmd ...) which always exports to the child.

Signed-off-by: LeTamanoir <martin.saldinger@kiln.fi>

Author: LeTamanoir

src/Completions.test.ts

@@ -231,7 +231,7 @@ describe('register', () => {
   test('bash: generates complete -F script with nospace support', () => {
     const script = Completions.register('bash', 'mycli')
     expect(script).toContain('_incur_complete_mycli()')
-    expect(script).toContain('COMPLETE="bash"')
+    expect(script).toContain('export COMPLETE="bash"')
     expect(script).toContain('complete -o default -o bashdefault -o nosort -F')
     expect(script).toContain('"mycli" -- "${COMP_WORDS[@]}"')
     expect(script).toContain('compopt -o nospace')
@@ -240,7 +240,7 @@ describe('register', () => {
   test('zsh: generates compdef script', () => {
     const script = Completions.register('zsh', 'mycli')
     expect(script).toContain('#compdef mycli')
-    expect(script).toContain('COMPLETE="zsh"')
+    expect(script).toContain('export COMPLETE="zsh"')
     expect(script).toContain('compdef _incur_complete_mycli mycli')
     expect(script).toContain('_describe')
   })

src/Completions.ts

@@ -232,8 +232,8 @@ function bashRegister(name: string): string {
     local _COMPLETE_INDEX=\${COMP_CWORD}
     local _completions
     _completions=( $(
-        COMPLETE="bash"
-        _COMPLETE_INDEX="$_COMPLETE_INDEX"
+        export COMPLETE="bash"
+        export _COMPLETE_INDEX="$_COMPLETE_INDEX"
         "${name}" -- "\${COMP_WORDS[@]}"
     ) )
     if [[ $? != 0 ]]; then
@@ -262,8 +262,8 @@ function zshRegister(name: string): string {
   return `#compdef ${name}
 _incur_complete_${id}() {
     local completions=("\${(@f)$(
-        _COMPLETE_INDEX=$(( CURRENT - 1 ))
-        COMPLETE="zsh"
+        export _COMPLETE_INDEX=$(( CURRENT - 1 ))
+        export COMPLETE="zsh"
         "${name}" -- "\${words[@]}" 2>/dev/null
     )}")
     if [[ -n $completions ]]; then