feat: config-driven architecture, install wizard, live runtime switching, usage tracking, auto-failover

Major changes:
- Config-driven adapters: all channels (Slack, Discord, Telegram, WebChat, Webhooks) controlled via config.json with enabled flags and token auto-detection, no CLI flags required
- Runtime engine field: runtime.engine selects opencode/claude from config
- Interactive install script: 8-phase setup wizard with AI runtime detection/installation, token setup, identity file personalization (personality presets), aetheel CLI command, background service (launchd/systemd)
- Live runtime switching: /engine, /model, /provider commands hot-swap the AI runtime from chat without restart, changes persisted to config.json
- Usage tracking: per-request cost extraction from Claude Code JSON output, cumulative stats via /usage command
- Auto-failover: rate limit detection on both runtimes, automatic switch to other engine on quota errors with user notification
- Chat commands work without / prefix (Slack intercepts / in channels), commands: engine, model, provider, config, usage, reload, cron, subagents, status, help
- /config set for editing config.json from chat with dotted key notation
- Security audit saved to docs/security-audit.md
- Full command reference in docs/commands.md
- Future changes doc with NanoClaw agent teams analysis
- Logo added to README and WebChat UI
- README fully rewritten with all features documented

pyproject.toml

@@ -3,23 +3,30 @@ name = "aetheel"
 version = "0.1.0"
 description = "A personal AI assistant that lives in Slack — with persistent memory, dual runtimes, and zero cloud dependencies."
 readme = "README.md"
-requires-python = ">=3.14"
+requires-python = ">=3.12"
 dependencies = [
     "apscheduler>=3.10.0,<4.0.0",
     "fastembed>=0.7.4",
     "python-dotenv>=1.2.1,<2.0.0",
     "python-telegram-bot>=21.0",
+    "discord.py>=2.4.0",
     "slack-bolt>=1.27.0,<2.0.0",
     "slack-sdk>=3.40.0,<4.0.0",
     "watchdog>=6.0.0",
+    "click>=8.1.0",
+    "aiohttp>=3.9.0",
 ]
 
 [project.optional-dependencies]
 test = [
     "pytest>=8.0",
     "pytest-asyncio>=0.24",
+    "hypothesis>=6.0",
 ]
 
+[project.scripts]
+aetheel = "cli:cli"
+
 [tool.setuptools.packages.find]
-include = ["agent*", "adapters*", "memory*", "skills*", "scheduler*"]
+include = ["agent*", "adapters*", "memory*", "skills*", "scheduler*", "heartbeat*", "hooks*", "webhooks*"]
 exclude = ["tests*", "archive*", "inspiration*"]