Add the tier 3 utility IRC commands (closes #87)

USERHOST, VERSION, ADMIN, INFO, TIME, KILL and WALLOPS on both the
HTTP API and the IRC listener, and user mode +w.

Model: opus-5-5

README.md

@@ -2389,8 +2389,8 @@ IRC_LISTEN_ADDR=
 | Connection | `NICK`, `USER`, `PASS`, `QUIT`, `PING`/`PONG`, `CAP`               |
 | Channels   | `JOIN`, `PART`, `MODE`, `TOPIC`, `NAMES`, `LIST`, `KICK`, `INVITE` |
 | Messaging  | `PRIVMSG`, `NOTICE`                                                |
-| Info       | `WHO`, `WHOIS`, `LUSERS`, `MOTD`, `AWAY`                           |
-| Operator   | `OPER` (requires `NEOIRC_OPER_NAME` and `NEOIRC_OPER_PASSWORD`)    |
+| Info       | `WHO`, `WHOIS`, `LUSERS`, `MOTD`, `AWAY`, `USERHOST`, `VERSION`, `ADMIN`, `INFO`, `TIME` |
+| Operator   | `OPER`, `KILL`, `WALLOPS` (requires `NEOIRC_OPER_NAME` and `NEOIRC_OPER_PASSWORD`) |
 
 ### Protocol Details
 
@@ -2406,6 +2406,15 @@ IRC_LISTEN_ADDR=
   operator status (`@`).
 - **Channel modes**: `+m` (moderated), `+t` (topic lock), `+o` (operator), `+v`
   (voice)
+- **User modes**: `+o` (operator, set only via `OPER`), `+w` (receives
+  `WALLOPS`). `MODE` for any nick other than your own is rejected with
+  `ERR_USERSDONTMATCH` (502), for both queries and changes. Nick comparison
+  is case-insensitive.
+- **KILL**: an operator's `KILL` broadcasts the victim's `QUIT` to its channel
+  peers, deletes its session, and then sends the victim a `KILL` and
+  `ERROR :Closing Link` before closing its socket. This applies to victims on
+  the IRC listener regardless of whether the `KILL` arrived over IRC or the
+  HTTP API.
 
 ### Bridge to HTTP API
 
@@ -2946,6 +2955,10 @@ guess is borne by the server (bcrypt), not the client.
       from additional devices via `POST /api/v1/login`
 - [x] **Cookie-based auth** — HttpOnly cookies replace Bearer tokens for all API
       authentication
+- [x] **Tier 3 utility commands** — `USERHOST` (302), `VERSION` (351), `ADMIN`
+      (256–259), `INFO` (371/374), `TIME` (391), `KILL` (operator-only forced
+      disconnect), `WALLOPS` (operator-only broadcast to `+w` users)
+- [x] **User mode +w** — receive `WALLOPS`, set with `MODE <nick> +w` / `-w`
 
 ### Future (1.0+)