Split ChanFix into one file per command

lib.rs kept only the struct and the dispatcher; SCORES and CHANFIX now
each live in their own file (scores.rs, fix.rs), matching every other
service. No behaviour change.

modules/chanfix/src/fix.rs

@@ -0,0 +1,54 @@
+use fedserv_api::{NetView, Sender, ServiceCtx, Store};
+
+// A channel with this many ops isn't opless and needs no fix.
+const OP_THRESHOLD: usize = 3;
+// The top score must reach this before a channel has enough history to fix.
+const MIN_FIX_SCORE: u32 = 12;
+// Reop identities scoring at least this fraction of the top score.
+const FIX_STEP: f64 = 0.30;
+
+// CHANFIX <#channel>: reop the channel's trusted regulars from accumulated
+// op-time. Defers to ChanServ for any registered channel.
+pub fn handle(me: &str, from: &Sender, chan: Option<&str>, ctx: &mut ServiceCtx, net: &dyn NetView, db: &mut dyn Store) {
+    let Some(chan) = chan else {
+        ctx.notice(me, from.uid, "Syntax: CHANFIX <#channel>");
+        return;
+    };
+    // Defer to ChanServ for anything it owns.
+    if db.channel(chan).is_some() {
+        ctx.notice(me, from.uid, format!("\x02{chan}\x02 is registered — use \x02ChanServ\x02 to manage it."));
+        return;
+    }
+    if net.op_count(chan) >= OP_THRESHOLD {
+        ctx.notice(me, from.uid, format!("\x02{chan}\x02 already has ops — nothing to fix."));
+        return;
+    }
+    let scores = net.chanfix_scores(chan);
+    let highscore = scores.first().map(|(_, s)| *s).unwrap_or(0);
+    if highscore < MIN_FIX_SCORE {
+        ctx.notice(me, from.uid, format!("\x02{chan}\x02 doesn't have enough op-time history to fix yet."));
+        return;
+    }
+    let threshold = ((highscore as f64 * FIX_STEP) as u32).max(1);
+
+    // Reop present members whose identity scores at or above the threshold and who
+    // aren't already opped.
+    let members: Vec<String> = net.channel_members(chan);
+    let mut opped = 0;
+    for uid in &members {
+        if net.is_op(chan, uid) {
+            continue;
+        }
+        let id = net.account_of(uid).or_else(|| net.host_of(uid));
+        let qualifies = id.is_some_and(|i| scores.iter().any(|(sid, s)| sid.eq_ignore_ascii_case(i) && *s >= threshold));
+        if qualifies {
+            ctx.channel_mode(me, chan, &format!("+o {uid}"));
+            opped += 1;
+        }
+    }
+    if opped == 0 {
+        ctx.notice(me, from.uid, format!("None of \x02{chan}\x02's trusted regulars are here right now."));
+    } else {
+        ctx.notice(me, from.uid, format!("Reopped \x02{opped}\x02 trusted regular(s) in \x02{chan}\x02."));
+    }
+}