Track channel operators; improve WHO, WHOIS, CAP, NAMES, TOPIC

Channel operators:
- Auto-op channel creator on JOIN (first user to join gets @)
- Track ops in :ops atom, clean up on PART/QUIT/KICK
- KICK now requires channel operator status (482)
- NAMES shows @ prefix for operators
- WHO shows @ in flags for operators
- Add is-op? and names-for helpers

WHO improvements:
- Include realname (not nick) in trailing field of 352
- Support WHO * (list all visible users)
- Case-insensitive nick lookup for WHO <nick>
- Show G (gone/away) or H (here) + @ for ops in flags

WHOIS improvements:
- Add RPL_WHOISSERVER (312)
- Support WHOIS <target> <nick> two-param form
- Case-insensitive nick lookup

CAP improvements:
- NAK preserves exact requested string (no reordering)
- Add multi-prefix to supported capabilities

NAMES improvements:
- NAMES without args lists all channels with members
- Use names-for helper for consistent @ prefix rendering

TOPIC: return 403 for nonexistent channel (was 442)

irctest: 220 passed, 426 failed, 218 skipped (up from 214).
Unit: 260 assertions, Integration: 38 assertions — all pass.

2 files changed, 9 insertions, 5 deletions

diff --git a/tests/integration.clj b/tests/integration.clj
index 769af90..ed70e4e 100644
--- a/tests/integration.clj
+++ b/tests/integration.clj
@@ -43,7 +43,8 @@
      :process-id process-id
      :net-id     net-id
      :clients    (atom {})
-     :channels   (atom {})}))
+     :channels   (atom {})
+     :ops        (atom {})}))
 
 (defn- make-client
   "Creates a simulated client connection using piped streams.
diff --git a/tests/unit.clj b/tests/unit.clj
index f2718eb..f6a74de 100644
--- a/tests/unit.clj
+++ b/tests/unit.clj
@@ -110,7 +110,8 @@
           :papod.process/hostname   "test"
           :papod.process/started-at (java.util.Date.)}])
       {:conn conn :cracha cracha-state :process-id proc-id
-       :clients (atom {}) :channels (atom {})})))
+       :clients (atom {}) :channels (atom {})
+       :ops (atom {})})))
 
 (defn test-network!
   [conn]
@@ -587,7 +588,7 @@
   (testing "CAP REQ unsupported capability"
     (let [c (atom {:nick "x" :cap-negotiating? true})]
       (is (string/includes?
-           (first (handle-cap ["REQ" ":multi-prefix"] c no-conn))
+           (first (handle-cap ["REQ" ":unknown-cap"] c no-conn))
            "NAK"))))
   (testing "already authenticated"
     (let [c (atom {:nick "x" :caps #{"sasl"} :authenticated? true})]
@@ -1258,7 +1259,8 @@
             :clients (atom {"alice" {:w alice-out}
                             "bob"   {:w bob-out}
                             "baz"   {:w baz-out}})
-            :channels (atom {"#test" #{"alice" "bob" "baz"}}))
+            :channels (atom {"#test" #{"alice" "bob" "baz"}})
+            :ops (atom {"#test" #{"alice"}}))
           alice (registered-client "alice" alice-out)]
       (handle-kick ["#test" "bob" ":bye!"] alice components)
       ;; bob removed from channel
@@ -1278,7 +1280,8 @@
           (assoc (test-components)
             :clients (atom {"alice" {:w alice-out}
                             "bob"   {:w bob-out}})
-            :channels (atom {"#test" #{"alice" "bob"}}))
+            :channels (atom {"#test" #{"alice" "bob"}})
+            :ops (atom {"#test" #{"alice"}}))
           alice (registered-client "alice" alice-out)]
       (handle-kick ["#test" "bob"] alice components)
       (is (string/includes? (.toString bob-out "UTF-8")