chore: prepare v1.1.0 release

Update version numbers across Rust, Python, and documentation files to 1.1.0. Enhance the .gitignore to include macOS dSYM files and plans directory. Introduce new dependencies in the Rust core library and update the README to reflect recent performance benchmarks and backtesting engine capabilities. Add new artifacts to the benchmarks manifest and improve documentation for the backtesting engine API.

fuzz/fuzz_targets/fuzz_mfi.rs

@@ -0,0 +1,51 @@
+/*!
+Fuzz target for `ferro_ta_core::volume::mfi`.
+
+Verifies that MFI never panics, output length matches input, and finite
+values lie in [0, 100].
+*/
+
+#![no_main]
+
+use libfuzzer_sys::fuzz_target;
+use ferro_ta_core::volume;
+
+fuzz_target!(|data: &[u8]| {
+    if data.len() < 2 {
+        return;
+    }
+
+    let timeperiod = ((data[0] as usize) % 64) + 1;
+
+    // Need 4 f64s per bar (high, low, close, volume)
+    let float_bytes = &data[1..];
+    let n_floats = float_bytes.len() / 8;
+    let n_bars = n_floats / 4;
+    if n_bars == 0 {
+        return;
+    }
+
+    let all_floats: Vec<f64> = (0..n_bars * 4)
+        .map(|i| {
+            let chunk: [u8; 8] = float_bytes[i * 8..(i + 1) * 8].try_into().unwrap();
+            f64::from_le_bytes(chunk)
+        })
+        .collect();
+
+    let high = &all_floats[..n_bars];
+    let low = &all_floats[n_bars..n_bars * 2];
+    let close = &all_floats[n_bars * 2..n_bars * 3];
+    let vol = &all_floats[n_bars * 3..n_bars * 4];
+
+    let result = volume::mfi(high, low, close, vol, timeperiod);
+    assert_eq!(result.len(), high.len(), "MFI output length mismatch");
+
+    for (i, &v) in result.iter().enumerate() {
+        if v.is_finite() {
+            assert!(
+                v >= 0.0 && v <= 100.0,
+                "MFI result[{i}] = {v} is out of [0, 100]"
+            );
+        }
+    }
+});