test: 100% coverage for wma + aroon_oscillator + atr + awesome_oscillator + cci (#22)

* test(wma): cover period/warmup/name + kill dead naive panic arm

Codecov flagged 10 lines in crates/wickra-core/src/indicators/wma.rs
(file at 92.48%): const accessor period (56-58), Indicator-impl
warmup_period (111-113), name (119-121), and line 186 — the
`_ => panic!("warmup mismatch")` arm in matches_naive_over_random_
inputs, an invariant guard that never fires when both streams share
a warmup period.

Add accessors_and_metadata covering the three metadata methods.
Refactor matches_naive_over_random_inputs to assert the warmup-shape
invariant via assert_eq!(g.is_some(), w.is_some()) + if let,
removing the dead panic arm.

wma.rs is now at 133/133 lines, no behavioural change.

* test(aroon_oscillator): cover period/value accessors + name metadata

Codecov flagged 9 lines in crates/wickra-core/src/indicators/aroon_
oscillator.rs (file at 90.42%): const accessors period (57-59),
value (62-64) and Indicator-impl name (90-92). warmup_period is
already covered by warmup_period_matches_aroon.

Add accessors_and_metadata asserting period == 7, name ==
"AroonOscillator", and value() across the None (pre-warmup) and
Some (post-warmup) branches.

aroon_oscillator.rs is now at 94/94 lines, no behavioural change.

* test(atr): cover period/value accessors + name metadata

Codecov flagged 9 lines in crates/wickra-core/src/indicators/atr.rs
(file at 93.70%): const accessors period (54-57), value (59-62) and
Indicator-impl name body (103-105). warmup_period is exercised
indirectly via downstream indicators; the metadata getters were
never queried directly.

Add accessors_and_metadata asserting period == 14, name == "ATR",
and value() across the None (pre-warmup) and Some (post-warmup)
branches.

atr.rs is now at 143/143 lines, no behavioural change.

* test(awesome_oscillator): cover periods accessor + warmup/name metadata

Codecov flagged 9 lines in crates/wickra-core/src/indicators/awesome_
oscillator.rs (file at 88.15%): const accessor periods (59-61),
Indicator-impl warmup_period (83-85), name (91-93). The classic()
constructor is covered indirectly through the existing tests; only
the metadata methods were dead.

Add accessors_and_metadata asserting periods == (5, 34),
warmup_period == 34 (= slow_period), name == "AwesomeOscillator".

awesome_oscillator.rs is now at 76/76 lines, no behavioural change.

* test(cci): cover period accessor + warmup/name metadata

Codecov flagged 9 lines in crates/wickra-core/src/indicators/cci.rs
(file at 89.65%): const accessor period (68-70), Indicator-impl
warmup_period (102-104), name (110-112). Existing tests never
inspected the metadata surface.

Add accessors_and_metadata asserting period == 20, warmup_period ==
20, name == "CCI".

cci.rs is now at 87/87 lines, no behavioural change.

crates/wickra-core/src/indicators/atr.rs

@@ -151,6 +151,21 @@ mod tests {
         assert!(matches!(Atr::new(0), Err(Error::PeriodZero)));
     }
 
+    /// Cover the const accessors `period` / `value` (54-62) and the
+    /// Indicator-impl `name` body (103-105). Existing tests inspect
+    /// numeric ATR output but never query the metadata.
+    #[test]
+    fn accessors_and_metadata() {
+        let mut atr = Atr::new(14).unwrap();
+        assert_eq!(atr.period(), 14);
+        assert_eq!(atr.name(), "ATR");
+        assert_eq!(atr.value(), None);
+        for _ in 0..14 {
+            atr.update(c(11.0, 9.0, 10.0));
+        }
+        assert!(atr.value().is_some());
+    }
+
     #[test]
     fn warmup_emits_on_period_th_candle() {
         let candles = vec![