fix(completion): close shell completion review gaps

scripts/completion/README.md

@@ -137,7 +137,7 @@ $ ccs auth show <TAB>
 work      personal  team      --json
 
 $ ccs api <TAB>
-create    discover  copy      export  import  remove
+create    list      discover  copy    export  import  remove
 ```
 
 ### Backend Contract

scripts/completion/ccs.fish

@@ -7,6 +7,9 @@ function __fish_ccs_complete
     end
 
     set -l current (commandline -ct)
+    if test -n "$current"; and test (count $tokens_before_current) -gt 0; and test "$tokens_before_current[-1]" = "$current"
+        set -e tokens_before_current[-1]
+    end
 
     set -l script_file (status filename)
     set -l repo_root (realpath (dirname $script_file)/../.. 2>/dev/null)

tests/unit/commands/shell-completion-command.test.ts

@@ -1,3 +1,6 @@
+import { readFileSync } from 'node:fs';
+import { join } from 'node:path';
+
 import { describe, it, expect, beforeAll, beforeEach, afterEach, mock } from 'bun:test';
 
 type ShellTarget = 'bash' | 'zsh' | 'fish' | 'powershell' | null;
@@ -139,4 +142,15 @@ describe('shell-completion command', () => {
       true
     );
   });
+
+  it('fish completion strips a duplicated partial token before delegating to __complete', () => {
+    const fishScript = readFileSync(
+      join(import.meta.dir, '../../../scripts/completion/ccs.fish'),
+      'utf8'
+    );
+
+    expect(fishScript).toContain('set -l current (commandline -ct)');
+    expect(fishScript).toContain('test "$tokens_before_current[-1]" = "$current"');
+    expect(fishScript).toContain('set -e tokens_before_current[-1]');
+  });
 });