Merge develop into main

README.md

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 A tree-shaped manager for stateful long-running processes on Urbit.
 
+- **Grub-based Shrubbery** - Active, bug-like processes inspired by %spider in a file system inspired by Shrubbery. Emphasis on **doing** over **being**.
+- **Grug-brained Shrubbery** - Aims at a simple, mechanical feel with few moving parts.
+- **Groundwire Shrubbery** - Asynchronous monadic processes allow easy expression of complex blockchain operations. Sandboxing provides security.
+
 ## Core Concepts
 
 **Grub** — a file and its running process. Files are the leaves of the tree. Each file has content (a cage) and a long-running fiber that operates on it. When a grub's process completes, the grub is deleted. When it fails, it restarts.
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 **Dart** — an effect yielded by a fiber. Darts are the fiber's way of interacting with the world: making new grubs, poking files, peeking at state, subscribing to directories, sending gall cards, and so on.
 
-**Intake** — an event received by a fiber. Intakes are responses to darts (peek results, poke acks), external inputs (incoming pokes, subscription updates), or lifecycle events (process start, restart after failure).
+**Intake** — an event received by a fiber. Intakes are responses to darts (peek results, poke acks), external inputs (incoming pokes, subscription updates), or lifecycle events (process start, restart after failure).