# next — fed-sx Milestone 1 kernel

Single-instance, single-actor fed-sx server built as Erlang-on-SX modules.
See `plans/fed-sx-design.md` for the architecture and
`plans/fed-sx-milestone-1.md` for the build plan.

## Layout

```
next/
├── kernel/      Erlang-on-SX kernel modules (.erl, hot-loaded via code:load_binary/3)
├── genesis/     SX source files for the genesis bootstrap bundle (DefineActivity, ...)
├── tests/       Bash test scripts driving sx_server.exe via the epoch protocol
└── data/        Runtime state — gitignored
    ├── log/         per-actor JSONL outboxes
    ├── objects/     CID-addressed artifacts on disk
    ├── snapshots/   projection snapshots
    ├── indexes/     derived projection index files
    └── keys/        actor signing keys + bearer tokens
```

## Substrate

The kernel is Erlang-on-SX. Each `.erl` source file is hot-loaded at boot via
`code:load_binary(Mod, Filename, SourceString)` (Erlang Phase 7 BIF). The
underlying SX runtime provides the host primitives the kernel calls into:
`crypto:*`, `cid:*`, `file:*`, `code:*`, and (Step 8) `http:listen/2`.

Tests drive the kernel via the epoch protocol:

```bash
printf '(epoch 1)\n(load "lib/erlang/runtime.sx")\n(epoch 2)\n<test-expr>\n' \
  | hosts/ocaml/_build/default/bin/sx_server.exe
```