Migrate to Docker: containerize for docker-server deployment

- Add Dockerfile + cron.js (daily 4pm UTC loop replacing EC2 cron)
- Add infra/docker-compose.yml and deploy-stack.sh for Portainer
- Support DATA_DIR env var in bot.js for persistent history volume
- Support PROMPTS_JSON env var in cron.js (no SSH needed for config)

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

CLAUDE.md

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+# xBot
+
+AI-powered Twitter/X bot that generates tweets via the Anthropic Claude API and posts them using stealth browser automation through Kernel.sh (residential proxies + CAPTCHA solving).
+
+## Key Features
+- AI tweet generation (claude-sonnet-4-6, max 280 tokens)
+- Multi-account support (credentials keyed by account name in .env)
+- Configurable scheduling (daily or random interval posting)
+- Tweet history tracking to avoid repetition
+- Link injection (URLs added post-generation, never sent to AI)
+- Anti-detection: keyboard.type() with delays, adaptive login flow
+
+## Tech Stack
+Node.js 18+ (ES modules), @onkernel/sdk, dotenv
+
+## Project Structure
+- `bot.js` — Core logic: login to X, generate tweet via Claude, post it
+- `scheduler.js` — Picks random times within a window, invokes bot.js via child_process
+- `package.json` — Dependencies & scripts
+- `.env` — Credentials (not tracked)
+- `prompts.json` — Prompt configs with account mapping, schedule, and link placeholders (not tracked)
+- `history-<prompt-name>.json` — Per-prompt tweet history (auto-generated)
+
+## Entry Points
+- `node bot.js <prompt-name>` — Post a single tweet immediately
+- `node scheduler.js <prompt-name>` — Schedule random posts for the day
+
+## External Services
+| Service | Purpose | Config Key |
+|---------|---------|------------|
+| **Kernel.sh** | Stealth browser automation (residential proxies, CAPTCHA solving, Playwright) | `KERNEL` env var |
+| **Anthropic Claude API** | Tweet generation | `ANTHROPIC` env var |
+| **X/Twitter** | Target platform for posting | Per-account: `{PREFIX}_USER`, `{PREFIX}_PW`, `{PREFIX}_EMAIL`, `{PREFIX}_PHONE` |
+
+Multi-account credentials use uppercase prefix pattern in .env (e.g., MYACCOUNT_USER, MYACCOUNT_PW).
+
+## Deployment
+Deployed on AWS EC2 in **us-west-2**:
+- Instance: `i-088b711cac69e6ac9`
+- Name: `xbot`
+- Type: `t4g.nano` (ARM-based)
+- Public IP: `44.249.48.3`
+- AWS account: `457667483187`
+- Cron: `0 16 * * *` (4pm UTC / before 8am PST window), one job per prompt
+
+## Guidelines
+- All changes must preserve stealth/anti-detection behavior and multi-account architecture
+- bot.js is the core; scheduler.js orchestrates timing
+- Config lives in .env + prompts.json
+- All project memory/context stays in this file (or a `CLAUDE-memory/` folder in the repo) — never save to the external `~/.claude/projects/.../memory/` system