fix: extract matrix password from backtick code span (real conduit format)

The live conduit admin-room reply (observed directly in #admins) is:

  Successfully reset the password for user @x:server: `<password>`

The delimiter is ': ' after the user id, NOT ' to:' — so the ' to: ' marker
added earlier never matched the real format, and extract_new_password returned
None for every reply, timing out auto-recovery for every agent.

conduit always renders the password as a backtick code span, so anchor on
that directly: take the content of the first backtick pair when the message
is a password-reset success. Guard against a code-spanned matrix user id in
an error message (a real password has no whitespace and isn't @localpart:server).
Prose markers stay as a fallback for hypothetical non-code-span builds.

Tests cover the exact live format and the code-spanned-user-id error case.

hive-c0re/src/matrix.rs

@@ -365,6 +365,32 @@ fn extract_new_password(bot_message: &str) -> Option<String> {
     // ASCII lowercase: same byte length as the original, so positions from
     // `lower.find(marker)` are valid byte indices into `bot_message`.
     let lower = bot_message.to_ascii_lowercase();
+
+    // Primary strategy: the conduit/tuwunel admin bot always renders the new
+    // password as a backtick code span. The live reply observed in the admin
+    // room is:
+    //   "Successfully reset the password for user @x:server: `<password>`"
+    // (note the delimiter is ": " after the user id, NOT " to:" — the prose
+    // wording varies between builds, so anchoring on the code span is the
+    // robust extraction). Take the content of the first backtick pair when the
+    // message is a password-reset success. Guard against grabbing a code-spanned
+    // matrix user id ("@x:server") from an error message: a real password has
+    // no whitespace and isn't a `@localpart:server` id.
+    if lower.contains("password")
+        && let Some(open) = bot_message.find('`')
+    {
+        let after = &bot_message[open + 1..];
+        if let Some(close) = after.find('`') {
+            let pw = &after[..close];
+            if !pw.is_empty()
+                && !pw.contains(char::is_whitespace)
+                && !(pw.starts_with('@') && pw.contains(':'))
+            {
+                return Some(pw.to_owned());
+            }
+        }
+    }
+
     for marker in &[
         // Explicit "is:" variants (most common in conduwuit / tuwunel):
         "new password is: ",
@@ -503,6 +529,24 @@ mod extract_new_password_tests {
         assert_eq!(extract_new_password(msg).as_deref(), Some("hunter2"));
     }
 
+    #[test]
+    fn conduit_live_admin_room_format() {
+        // The ACTUAL reply observed in the live #admins room — the delimiter
+        // is ": " after the user id (no " to:"), password in a code span.
+        let msg = "Successfully reset the password for user @triage:pr1ma.darkest.space: `hVfa6TpvIKnADoEJNWn9saHoI`";
+        assert_eq!(
+            extract_new_password(msg).as_deref(),
+            Some("hVfa6TpvIKnADoEJNWn9saHoI")
+        );
+    }
+
+    #[test]
+    fn codespan_userid_in_error_not_mistaken_for_password() {
+        // An error that code-spans the user id must not yield it as a password.
+        let msg = "Failed to reset password for `@sock:pr1ma.darkest.space` — user not found";
+        assert_eq!(extract_new_password(msg), None);
+    }
+
     #[test]
     fn bare_new_password_colon() {
         let msg = "New password: P@ssword1";