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/hooks/block-cargo-lock.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+# Block direct edits to Cargo.lock — it should only change via cargo
+INPUT=$(cat)
+FILE_PATH=$(echo "$INPUT" | jq -r '.tool_input.file_path // empty')
+
+if [[ "$FILE_PATH" == *"Cargo.lock" ]]; then
+    echo '{
+        "hookSpecificOutput": {
+            "hookEventName": "PreToolUse",
+            "permissionDecision": "deny",
+            "permissionDecisionReason": "Cargo.lock is auto-generated. Use cargo to update dependencies."
+        }
+    }'
+else
+    exit 0
+fi

.claude/hooks/format-rs.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+# Auto-format Rust files after Edit/Write
+INPUT=$(cat)
+FILE_PATH=$(echo "$INPUT" | jq -r '.tool_input.file_path // empty')
+
+if [[ "$FILE_PATH" == *.rs ]]; then
+    rustfmt --edition 2021 "$FILE_PATH" 2>/dev/null || true
+fi

.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"
+          }
+        ]
+      }
+    ]
+  }
+}

.claude/skills/release/SKILL.md

@@ -0,0 +1,17 @@
+---
+name: release
+description: Build claudify .deb package and show build info
+disable-model-invocation: true
+---
+
+# Release
+
+Build the claudify .deb package and verify the output.
+
+## Steps
+
+1. Run `cargo tauri build` from the project root
+2. Show the build output path and file size
+3. Inspect the .deb package metadata with `dpkg-deb --info`
+4. List the .deb package contents with `dpkg-deb --contents`
+5. Report the package name, version, architecture, and installed size