Scaffold the federated services daemon

Protocol-agnostic core: a Protocol trait maps raw server-to-server lines to a
normalized event/action model, so the engine never touches a raw line and a new
ircd is one new module. Adds event-log state (state is a fold over the log) and
a service framework. First protocol impl links to an InspIRCd (insp4) uplink —
completes the CAPAB/SERVER handshake, bursts, and introduces NickServ.

README.md

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+# fedserv
+
+A federated IRC services daemon in Rust. Protocol-agnostic core, InspIRCd link first.
+
+Clean-room — inspired by the ideas behind modern event-log/gossip services, not
+derived from any project's source.
+
+## Design
+
+- **`proto/`** — the ircd link layer. A `Protocol` trait maps raw server-to-server
+  lines to/from a normalized `NetEvent`/`NetAction` model. The engine never touches
+  a raw line, so a new ircd = one new module. InspIRCd is the first.
+- **`engine/`** — the services engine: live network `state`, an `EventLog` (every
+  persistent change is an `Event`; state is a fold over the log — this is what makes
+  replicating across nodes a later addition, not a rewrite), and the `Service` trait.
+- **`services/`** — the pseudo-clients: NickServ first, then ChanServ / OperServ / …
+
+## Run
+
+```sh
+cp config.example.toml config.toml   # edit uplink + link password
+cargo run -- config.toml
+```
+
+## Status
+
+Early scaffold: links to an InspIRCd uplink and introduces NickServ. Burst/mode
+handling and account persistence are next.