feat(clone-app): add /clone-app command and README

plugins/clone-app/README.md

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+# clone-app — Clone Feasibility Analyzer (Claude Code skill)
+
+Give it a Google Play URL. It downloads the APK, reverse engineers the tech
+stack and APIs (via the sibling `android-reverse-engineering` plugin), analyzes
+the app's store presence, estimates **AI-assisted** build effort (in AI Sprints)
+and monthly infrastructure cost, judges market viability (GO / CONDITIONAL GO /
+NO GO), and — if you approve — generates a full implementation plan.
+
+## Requirements
+- The `android-reverse-engineering` plugin (ships in this same repo).
+- Java JDK 17+ and jadx (the RE plugin auto-installs jadx if missing).
+- `curl`, Python 3 (stdlib only), `unzip`.
+
+## Install
+```text
+/plugin marketplace add /path/to/this/repo
+/plugin install android-reverse-engineering@android-reverse-engineering-skill
+/plugin install clone-app@android-reverse-engineering-skill
+```
+
+## Usage
+```text
+/clone-app https://play.google.com/store/apps/details?id=com.example.app
+```
+Or natural language: "Analyze this Play Store app for cloning: <url>".
+
+The skill pauses twice for your input: choosing the clone stack, and deciding
+whether to generate the implementation plan.
+
+## Output
+```
+./work/<package>/
+├── app.apk | app.xapk
+├── output/            # decompiled sources + Kotlin name maps
+├── play.json          # store metrics
+├── appstore.json      # iOS presence
+└── clone-report-YYYY-MM-DD.md
+```
+
+## Keeping the RE plugin up to date
+This repo is a fork. To pull upstream improvements:
+```bash
+git remote add upstream https://github.com/SimoneAvogadro/android-reverse-engineering-skill.git
+git pull upstream master
+```
+The clone-app plugin lives in its own directory, so upstream updates to
+`android-reverse-engineering` merge cleanly.
+
+## Legal
+For lawful use only — your own apps, authorized interoperability, security
+research, or education. You are responsible for compliance.

plugins/clone-app/commands/clone-app.md

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+---
+allowed-tools: Bash, Read, Glob, Grep, Write, Edit, WebFetch, WebSearch, Skill
+description: Analyze a Google Play app for cloning — RE, effort, market viability, optional plan
+user-invocable: true
+argument-hint: <Google Play URL or package name>
+argument: Google Play URL or package name (optional)
+---
+
+# /clone-app
+
+Run the full clone-feasibility workflow on a Google Play app.
+
+## Instructions
+
+Follow the clone-app skill workflow in
+`${CLAUDE_PLUGIN_ROOT}/skills/clone-app/SKILL.md` exactly, phases 0 through 7.
+
+### Step 1: Get the target
+If the user passed a URL or package name as an argument, use it. Otherwise ask
+for the Google Play URL or package name.
+
+### Step 2: Run the skill
+Execute Phase 0 → Phase 7 from SKILL.md. Pause for the user at:
+- Phase 4 (stack choice),
+- Phase 7 (proceed to implementation plan?).
+
+Honor the Error Handling Summary table in SKILL.md at every phase.
+
+### Step 3: Deliver
+Ensure the report is written to `./work/<package>/clone-report-<date>.md` and
+summarize the verdict. If the user approves at Phase 7, invoke
+`superpowers:writing-plans` with the report as the spec.