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.

src/volume/obv.rs

@@ -2,7 +2,7 @@ use crate::validation;
 use numpy::{IntoPyArray, PyArray1, PyReadonlyArray1};
 use pyo3::prelude::*;
 
-/// On Balance Volume: cumulates volume * sign(close - prev_close); bar 0 uses volume.
+/// On Balance Volume: cumulates volume * sign(close - prev_close).
 #[pyfunction]
 pub fn obv<'py>(
     py: Python<'py>,
@@ -13,15 +13,6 @@ pub fn obv<'py>(
     let vols = volume.as_slice()?;
     let n = closes.len();
     validation::validate_equal_length(&[(n, "close"), (vols.len(), "volume")])?;
-    let mut result = vec![0.0_f64; n];
-    let mut obv_val = 0.0_f64;
-    for i in 1..n {
-        if closes[i] > closes[i - 1] {
-            obv_val += vols[i];
-        } else if closes[i] < closes[i - 1] {
-            obv_val -= vols[i];
-        }
-        result[i] = obv_val;
-    }
+    let result = ferro_ta_core::volume::obv(closes, vols);
     Ok(result.into_pyarray(py))
 }