refactor(tool): simplify edit_file to parameter-based input only

- Remove JSON input support, use CLI parameters only
- Remove line mode, keep text replacement only
- Add sed as line operation alternative in tool-strategy.md
- Update documentation to English

Usage: ccw tool exec edit_file --path file.txt --old "old" --new "new"

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

ccw/src/cli.js

@@ -108,9 +108,12 @@ export function run(argv) {
 
   // Tool command
   program
-    .command('tool [subcommand] [args] [json]')
+    .command('tool [subcommand] [args]')
     .description('Execute CCW tools')
-    .action((subcommand, args, json) => toolCommand(subcommand, args, { json }));
+    .option('--path <path>', 'File path (for edit_file)')
+    .option('--old <text>', 'Old text to replace (for edit_file)')
+    .option('--new <text>', 'New text (for edit_file)')
+    .action((subcommand, args, options) => toolCommand(subcommand, args, options));
 
   program.parse(argv);
 }