Add Claude Code hooks and release skill

- PostToolUse hook: auto-format .rs files with rustfmt after edit
- PreToolUse hook: block direct edits to Cargo.lock
- /release skill: build .deb and inspect package metadata

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.claude/settings.json

@@ -0,0 +1,27 @@
+{
+  "hooks": {
+    "PostToolUse": [
+      {
+        "matcher": "Edit|Write",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "$CLAUDE_PROJECT_DIR/.claude/hooks/format-rs.sh",
+            "statusMessage": "Formatting Rust code..."
+          }
+        ]
+      }
+    ],
+    "PreToolUse": [
+      {
+        "matcher": "Edit|Write",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "$CLAUDE_PROJECT_DIR/.claude/hooks/block-cargo-lock.sh"
+          }
+        ]
+      }
+    ]
+  }
+}