feat(#433): add help command to list available API actions

[giulio-leone]

Summary

Closes #433

Adds a help command that returns all available API action names, making it easy for users and agents to discover the full set of supported commands.

Changes

• src/protocol.ts: Export commandSchema and add help action to the discriminated union
• src/types.ts: Add HelpCommand interface and include it in the Command union type
• src/actions.ts: Add help case that introspects commandSchema options to extract and return a sorted list of all action names
• cli/src/commands.rs: Add help / commands CLI aliases that send {"action": "help"} to the daemon

Usage

# CLI
agent-browser help
agent-browser commands

# JSON API
{"id": "1", "action": "help"}

Returns a sorted list of all available commands (e.g. Available commands: addscript, addstyle, back, ...).

[vercel]

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[vercel]

The HelpCommand type was added to the Command union in types.ts, but no corresponding Zod schema or command handler was implemented, making the help command non-functional.

[giulio-leone]

✅ Fixed in commit c3e2e2a.