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Add note about %say generators and Gall agents.

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content/guides/core/hoon-school/O-subject.md
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@ -255,6 +255,8 @@ To act in a stateful manner, a core must mutate itself and then pin the mutated
We will use `%say` generators as a bridge concept. We will produce some short applications that maintain state while carrying out a calculation; they still result in a single return value, but gesture at the big-picture approach to maintaining state in persistent agents.
[As you may recall](./J-stdlib-text.md), a `%say` generator is like a naked generator except rather than being simply a gate, it is a cell of `%say` (as a tag) and a gate. This gate can receive more information as gate arguments as part of its `sample`, such as a timestamp `now`, some entropy `eny`, and a file system beak `bec`. These allow us to think about how a core can modify and maintain state. Although a `%say` generator, like all generators, ultimately simply terminates, a Gall agent will be a persistent core with state that can continue to be used.
Here are a couple of new runes for modifying the subject and chaining computations together, aside from `%=` centis which you've already seen:
- [`=.` tisdot](/reference/hoon/rune/tis#-tisdot) is used to change a leg in the subject.