Add English skill locale support (#223)

feat: add English skill locale support with SKILL_en.md

agent_reach/cli.py

@@ -326,8 +326,30 @@ def _install_skill():
     import shutil
     import importlib.resources
 
+    def _is_english_locale(value: str) -> bool:
+        normalized = value.strip().lower()
+        return normalized.startswith("en") or normalized.startswith("english")
+
+    def _skill_resource_name() -> str:
+        locale_candidates = (
+            os.environ.get("AGENT_REACH_LANG", ""),
+            os.environ.get("LC_ALL", ""),
+            os.environ.get("LC_MESSAGES", ""),
+            os.environ.get("LANG", ""),
+        )
+        if any(_is_english_locale(candidate) for candidate in locale_candidates):
+            return "SKILL_en.md"
+        return "SKILL.md"
+
+    def _read_skill_markdown(skill_pkg):
+        resource_name = _skill_resource_name()
+        try:
+            return skill_pkg.joinpath(resource_name).read_text(encoding="utf-8")
+        except FileNotFoundError:
+            return skill_pkg.joinpath("SKILL.md").read_text(encoding="utf-8")
+
     def _copy_skill_dir(target: str) -> bool:
-        """Copy entire skill directory (SKILL.md + references/)."""
+        """Copy entire skill directory (locale-specific SKILL.md + references/)."""
         try:
             # Clear existing installation
             if os.path.exists(target):
@@ -337,13 +359,13 @@ def _install_skill():
             # Get skill directory from package (with fallback for editable installs)
             try:
                 skill_pkg = importlib.resources.files("agent_reach").joinpath("skill")
-                skill_md = skill_pkg.joinpath("SKILL.md").read_text(encoding="utf-8")
+                skill_md = _read_skill_markdown(skill_pkg)
             except Exception:
                 from pathlib import Path
                 skill_pkg = Path(__file__).resolve().parent / "skill"
-                skill_md = (skill_pkg / "SKILL.md").read_text(encoding="utf-8")
+                skill_md = _read_skill_markdown(skill_pkg)
 
-            # Copy SKILL.md
+            # Copy SKILL.md using the selected locale file
             with open(os.path.join(target, "SKILL.md"), "w", encoding="utf-8") as f:
                 f.write(skill_md)