chore: add CLAUDE.md and .claude config

.claude/settings.json

@@ -0,0 +1,16 @@
+{
+  "hooks": {
+    "PostToolUse": [
+      {
+        "matcher": "Write|Edit",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "python scripts/ruff_hook.py",
+            "timeout": 30
+          }
+        ]
+      }
+    ]
+  }
+}

.claude/settings.local.json

@@ -0,0 +1,14 @@
+{
+  "permissions": {
+    "allow": [
+      "Skill(update-config)",
+      "Bash(echo '{\"tool_name\":\"Edit\",\"tool_input\":{\"file_path\":\"D:\\\\\\\\python\\\\\\\\xmtdx\\\\\\\\src\\\\\\\\xmtdx\\\\\\\\__init__.py\"}}')",
+      "Bash(python -c \"import sys,json,subprocess;d=json.load\\(sys.stdin\\);f=d.get\\('tool_input',{}\\).get\\('file_path',''\\);exec\\('' if not f.endswith\\(\\\\\\\\'.py\\\\\\\\'\\) else 'subprocess.run\\([\\\\\\\\'ruff\\\\\\\\',\\\\\\\\'check\\\\\\\\',\\\\\\\\'--fix\\\\\\\\',f],capture_output=True\\);subprocess.run\\([\\\\\\\\'ruff\\\\\\\\',\\\\\\\\'format\\\\\\\\',f],capture_output=True\\)'\\);print\\(f'done: {f}'\\)\")",
+      "Bash(python *)",
+      "Bash(ruff check *)",
+      "Bash(git add *)",
+      "Bash(git commit *)",
+      "Bash(git push *)"
+    ]
+  }
+}

.claude/skills/verify/SKILL.md

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+---
+name: verify
+description: Run full offline verification suite (pytest unit tests + mypy + ruff) before committing changes.
+disable-model-invocation: true
+---
+
+# Verify
+
+Run the full offline verification pipeline:
+
+1. Run `python -m pytest tests/unit/ -v` — all unit tests must pass.
+2. Run `mypy src/` — strict type checking must pass with zero errors.
+3. Run `ruff check src/ tests/` — no lint errors.
+4. Run `ruff format --check src/ tests/` — formatting must be clean.
+
+If any step fails, fix the issues and re-run. Do not report completion until all four steps pass.