feat: make policy length limits configurable per engine (#624)

- Add PolicyLengthConfig struct with max_col, max_file_bytes, and
  max_lines fields, replacing hardcoded constants in the lexer.
- Add Engine::set_policy_length_config and clear_policy_length_config
  to allow callers to override the default limits.
- Add Source::from_contents_with_limits and from_file_with_limits for
  direct Source construction with custom limits; existing from_contents
  and from_file signatures are preserved using defaults.
- Add tests for default rejection, custom limits, and engine plumbing.
- Add bindings for C, C++, Python, WASM/JS, Java, Ruby, C#, Go

bindings/python/src/lib.rs

@@ -1,6 +1,7 @@
 // Copyright (c) Microsoft Corporation.
 // Licensed under the MIT License.
 use anyhow::{anyhow, Result};
+use core::num::{NonZeroU32, NonZeroUsize};
 use pyo3::exceptions::PyTypeError;
 use pyo3::prelude::*;
 use pyo3::types::*;
@@ -392,6 +393,35 @@ impl Engine {
             .add_extension(path, nargs, Box::new(extension_impl))
     }
 
+    /// Set the policy length limits used when loading policies.
+    ///
+    /// * `max_col`: Maximum column width per line.
+    /// * `max_file_bytes`: Maximum policy file size in bytes.
+    /// * `max_lines`: Maximum number of lines per policy file.
+    #[pyo3(signature = (*, max_col, max_file_bytes, max_lines))]
+    pub fn set_policy_length_config(
+        &mut self,
+        max_col: u32,
+        max_file_bytes: usize,
+        max_lines: usize,
+    ) -> Result<()> {
+        self.engine
+            .set_policy_length_config(::regorus::PolicyLengthConfig {
+                max_col: NonZeroU32::new(max_col)
+                    .ok_or_else(|| anyhow!("max_col must be non-zero"))?,
+                max_file_bytes: NonZeroUsize::new(max_file_bytes)
+                    .ok_or_else(|| anyhow!("max_file_bytes must be non-zero"))?,
+                max_lines: NonZeroUsize::new(max_lines)
+                    .ok_or_else(|| anyhow!("max_lines must be non-zero"))?,
+            });
+        Ok(())
+    }
+
+    /// Clear the policy length configuration, reverting to defaults.
+    pub fn clear_policy_length_config(&mut self) {
+        self.engine.clear_policy_length_config();
+    }
+
     /// Enable code coverage
     ///
     /// * `enable`: Whether to enable coverage or not.

bindings/python/test.py

@@ -10,6 +10,8 @@ if hasattr(sys.stdout, "reconfigure"):
 engine = regorus.Engine()
 
 engine.set_rego_v0(True)
+# Raise the default col limit to 2000
+engine.set_policy_length_config(max_col=2000, max_file_bytes=1048576, max_lines=20000)
 
 # Load policies
 pkg = engine.add_policy_from_file('../../tests/aci/framework.rego')