Add containerized agent execution with Apple Container

- Agents run in isolated Linux VMs via Apple Container
- All groups get Bash access (safe - sandboxed in container)
- Browser automation via agent-browser + Chromium
- Per-group configurable additional directory mounts
- File-based IPC for messages and scheduled tasks
- Container image with Node.js 22, Chromium, agent-browser

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

container/skills/agent-browser.md

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+---
+name: agent-browser
+description: Automates browser interactions for web testing, form filling, screenshots, and data extraction. Use when the user needs to navigate websites, interact with web pages, fill forms, take screenshots, test web applications, or extract information from web pages.
+allowed-tools: Bash(agent-browser:*)
+---
+
+# Browser Automation with agent-browser
+
+## Quick start
+
+```bash
+agent-browser open <url>        # Navigate to page
+agent-browser snapshot -i       # Get interactive elements with refs
+agent-browser click @e1         # Click element by ref
+agent-browser fill @e2 "text"   # Fill input by ref
+agent-browser close             # Close browser
+```
+
+## Core workflow
+
+1. Navigate: `agent-browser open <url>`
+2. Snapshot: `agent-browser snapshot -i` (returns elements with refs like `@e1`, `@e2`)
+3. Interact using refs from the snapshot
+4. Re-snapshot after navigation or significant DOM changes
+
+## Commands
+
+### Navigation
+
+```bash
+agent-browser open <url>      # Navigate to URL
+agent-browser back            # Go back
+agent-browser forward         # Go forward
+agent-browser reload          # Reload page
+agent-browser close           # Close browser
+```
+
+### Snapshot (page analysis)
+
+```bash
+agent-browser snapshot            # Full accessibility tree
+agent-browser snapshot -i         # Interactive elements only (recommended)
+agent-browser snapshot -c         # Compact output
+agent-browser snapshot -d 3       # Limit depth to 3
+agent-browser snapshot -s "#main" # Scope to CSS selector
+```
+
+### Interactions (use @refs from snapshot)
+
+```bash
+agent-browser click @e1           # Click
+agent-browser dblclick @e1        # Double-click
+agent-browser fill @e2 "text"     # Clear and type
+agent-browser type @e2 "text"     # Type without clearing
+agent-browser press Enter         # Press key
+agent-browser hover @e1           # Hover
+agent-browser check @e1           # Check checkbox
+agent-browser uncheck @e1         # Uncheck checkbox
+agent-browser select @e1 "value"  # Select dropdown option
+agent-browser scroll down 500     # Scroll page
+agent-browser upload @e1 file.pdf # Upload files
+```
+
+### Get information
+
+```bash
+agent-browser get text @e1        # Get element text
+agent-browser get html @e1        # Get innerHTML
+agent-browser get value @e1       # Get input value
+agent-browser get attr @e1 href   # Get attribute
+agent-browser get title           # Get page title
+agent-browser get url             # Get current URL
+agent-browser get count ".item"   # Count matching elements
+```
+
+### Screenshots & PDF
+
+```bash
+agent-browser screenshot          # Save to temp directory
+agent-browser screenshot path.png # Save to specific path
+agent-browser screenshot --full   # Full page
+agent-browser pdf output.pdf      # Save as PDF
+```
+
+### Wait
+
+```bash
+agent-browser wait @e1                     # Wait for element
+agent-browser wait 2000                    # Wait milliseconds
+agent-browser wait --text "Success"        # Wait for text
+agent-browser wait --url "**/dashboard"    # Wait for URL pattern
+agent-browser wait --load networkidle      # Wait for network idle
+```
+
+### Semantic locators (alternative to refs)
+
+```bash
+agent-browser find role button click --name "Submit"
+agent-browser find text "Sign In" click
+agent-browser find label "Email" fill "user@test.com"
+agent-browser find placeholder "Search" type "query"
+```
+
+### Authentication with saved state
+
+```bash
+# Login once
+agent-browser open https://app.example.com/login
+agent-browser snapshot -i
+agent-browser fill @e1 "username"
+agent-browser fill @e2 "password"
+agent-browser click @e3
+agent-browser wait --url "**/dashboard"
+agent-browser state save auth.json
+
+# Later: load saved state
+agent-browser state load auth.json
+agent-browser open https://app.example.com/dashboard
+```
+
+### Cookies & Storage
+
+```bash
+agent-browser cookies                     # Get all cookies
+agent-browser cookies set name value      # Set cookie
+agent-browser cookies clear               # Clear cookies
+agent-browser storage local               # Get localStorage
+agent-browser storage local set k v       # Set value
+```
+
+### JavaScript
+
+```bash
+agent-browser eval "document.title"   # Run JavaScript
+```
+
+## Example: Form submission
+
+```bash
+agent-browser open https://example.com/form
+agent-browser snapshot -i
+# Output shows: textbox "Email" [ref=e1], textbox "Password" [ref=e2], button "Submit" [ref=e3]
+
+agent-browser fill @e1 "user@example.com"
+agent-browser fill @e2 "password123"
+agent-browser click @e3
+agent-browser wait --load networkidle
+agent-browser snapshot -i  # Check result
+```
+
+## Example: Data extraction
+
+```bash
+agent-browser open https://example.com/products
+agent-browser snapshot -i
+agent-browser get text @e1  # Get product title
+agent-browser get attr @e2 href  # Get link URL
+agent-browser screenshot products.png
+```