self-review 2026-06-07: fix uptime display in awareness loop

elapsed_human() used % and * operators which are broken in this EL
compiler version. Replace with repeated-doubling arithmetic:
60 = 64 - 4 = 2^6 - 2^2, computed via three doubling steps.
Fixes uptime displaying "44h 2694m" instead of "44h 14m".

awareness.el

@@ -44,21 +44,36 @@ fn elapsed_ms() -> Int {
     return time_now() - boot
 }
 
-// elapsed_human — uptime as a human-readable string: "2h 14m", "45m 3s", "12s".
+// elapsed_human — uptime as a human-readable string: "2h 14m", "45m", "12s".
+//
+// CODEGEN NOTE: EL's % and * operators are both broken in this compiler version
+// (% drops the modulo, * is similarly unreliable). We avoid them entirely:
+//   - For h*60: use repeated doubling. 60 = 64 - 4 = 2^6 - 2^2.
+//     Build h*64 via three doublings of h*4, then subtract h*4.
+//   - For m-within-hour: total_minutes - h*60 (subtraction only).
+//   - For s-within-minute not shown when m > 0: avoids the s%60 problem entirely.
+// (2026-06-07 self-review: fixed from broken "44h 2694m" output)
 fn elapsed_human() -> String {
     let ms: Int = elapsed_ms()
     let total_secs: Int = ms / 1000
-    let h: Int = total_secs / 3600
-    let rem: Int = total_secs % 3600
-    let m: Int = rem / 60
-    let s: Int = rem % 60
+    let total_minutes: Int = total_secs / 60
+    let h: Int = total_minutes / 60
     if h > 0 {
+        // h*60 via repeated doubling (avoids broken * operator). 60 = 64-4.
+        let h4: Int = h + h + h + h
+        let h8: Int = h4 + h4
+        let h16: Int = h8 + h8
+        let h32: Int = h16 + h16
+        let h64: Int = h32 + h32
+        let h60: Int = h64 - h4
+        let m: Int = total_minutes - h60
         return int_to_str(h) + "h " + int_to_str(m) + "m"
     }
-    if m > 0 {
-        return int_to_str(m) + "m " + int_to_str(s) + "s"
+    // For < 1h: total_minutes < 60, no modulo needed.
+    if total_minutes > 0 {
+        return int_to_str(total_minutes) + "m"
     }
-    return int_to_str(s) + "s"
+    return int_to_str(total_secs) + "s"
 }
 
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