refactor: migrate crate library to use anyhow::Result

This enables CLI and crate to share the same error handling pattern,
which is a prerequisite for deduplicating stream and parser code.

- parser/stream.rs: use anyhow::Result instead of BBLError
- parser/decoder.rs: use anyhow::anyhow! for error messages
- parser/event.rs: use anyhow::Result
- parser/frame.rs: use anyhow::Result
- parser/gps.rs: use anyhow::Result
- parser/header.rs: use anyhow::Result and anyhow::anyhow!
- parser/main.rs: use anyhow::Result
- export.rs: use anyhow::Result

Addresses Issue #9: Refactor CLI to use crate library functions

Author: nerdCopter

src/export.rs

@@ -5,8 +5,7 @@
 
 use crate::conversion::*;
 use crate::types::*;
-use crate::Result;
-use anyhow::Context;
+use anyhow::{Context, Result};
 use std::collections::HashMap;
 use std::fs::File;
 use std::io::{BufWriter, Write};

src/parser/decoder.rs

@@ -1,5 +1,5 @@
-use crate::error::{BBLError, Result};
 use crate::parser::stream::BBLDataStream;
+use anyhow::Result;
 
 // BBL Encoding constants - directly from JavaScript reference
 pub const ENCODING_SIGNED_VB: u8 = 0;
@@ -46,7 +46,7 @@ pub fn decode_field_value(
             values[index] = 0;
         }
         _ => {
-            return Err(BBLError::InvalidEncoding(encoding));
+            return Err(anyhow::anyhow!("Invalid encoding type: {}", encoding));
         }
     }
     Ok(())
@@ -127,6 +127,6 @@ pub fn apply_predictor(
             let motor_output_min = sysconfig.get("motorOutput[0]").copied().unwrap_or(48);
             Ok(value + motor_output_min) // Force signed 32-bit like Betaflight
         }
-        _ => Err(BBLError::InvalidPredictor(predictor)),
+        _ => Err(anyhow::anyhow!("Invalid predictor type: {}", predictor)),
     }
 }

src/parser/event.rs

@@ -5,7 +5,7 @@
 
 use crate::parser::stream::BBLDataStream;
 use crate::types::EventFrame;
-use crate::Result;
+use anyhow::Result;
 
 /// Helper function to parse inflight adjustment events (types 4 and 13)
 /// Returns the event description string

src/parser/frame.rs

@@ -1,9 +1,9 @@
-use crate::error::Result;
 use crate::parser::{decoder::*, event::parse_e_frame, gps::*, stream::BBLDataStream};
 use crate::types::{
     DecodedFrame, EventFrame, FrameDefinition, FrameHistory, FrameStats, GpsCoordinate,
     GpsHomeCoordinate,
 };
+use anyhow::Result;
 use std::collections::HashMap;
 
 /// Parse frames from binary data

src/parser/gps.rs

@@ -12,7 +12,7 @@ use crate::parser::decoder::{
 use crate::parser::frame::parse_frame_data;
 use crate::parser::stream::BBLDataStream;
 use crate::types::{FrameDefinition, GpsCoordinate, GpsHomeCoordinate};
-use crate::Result;
+use anyhow::Result;
 use std::collections::HashMap;
 
 /// Parse H-frame (GPS home position) data from the stream

src/parser/header.rs

@@ -1,5 +1,5 @@
-use crate::error::{BBLError, Result};
 use crate::types::{BBLHeader, FrameDefinition};
+use anyhow::Result;
 use std::collections::HashMap;
 
 /// Parse BBL headers from text
@@ -157,9 +157,7 @@ fn parse_predictor_info(line: &str, frame_def: &mut FrameDefinition) -> Result<(
             frame_def.update_predictors(&predictors);
             Ok(())
         }
-        Err(_) => Err(BBLError::InvalidHeader(
-            "Invalid predictor values".to_string(),
-        )),
+        Err(_) => Err(anyhow::anyhow!("Invalid header: Invalid predictor values")),
     }
 }
 
@@ -178,9 +176,7 @@ fn parse_encoding_info(line: &str, frame_def: &mut FrameDefinition) -> Result<()
             frame_def.update_encoding(&encodings);
             Ok(())
         }
-        Err(_) => Err(BBLError::InvalidHeader(
-            "Invalid encoding values".to_string(),
-        )),
+        Err(_) => Err(anyhow::anyhow!("Invalid header: Invalid encoding values")),
     }
 }
 

src/parser/main.rs

@@ -1,6 +1,5 @@
 use crate::types::*;
-use crate::Result;
-use anyhow::{anyhow, Context};
+use anyhow::{anyhow, Context, Result};
 use std::path::Path;
 
 /// Parse BBL file and return all logs (for CLI and multi-log processing)

src/parser/stream.rs

@@ -1,4 +1,4 @@
-use crate::error::{BBLError, Result};
+use anyhow::Result;
 
 /// BBL data stream for reading binary data
 pub struct BBLDataStream<'a> {
@@ -30,7 +30,7 @@ impl<'a> BBLDataStream<'a> {
             Ok(byte)
         } else {
             self.eof = true;
-            Err(BBLError::UnexpectedEof)
+            Err(anyhow::anyhow!("EOF"))
         }
     }