refactor: make CSV export default, consolidate instruction files (#3)

* refactor: make CSV export default, consolidate instruction files

- Remove --csv flag (CSV export always enabled for CLI binary)
- Update help text to clarify CSV is default output format
- Delete outdated .github/instructions/rust-project.instructions.md
- AGENTS.md is now single source of truth for project instructions

BREAKING CHANGE: --csv flag removed, CSV export is now always enabled

* refactor: remove empty conditional block after CSV export for clarity

Author: nerdCopter

.github/instructions/rust-project.instructions.md

@@ -261,7 +261,7 @@ impl CsvFieldMap {
 fn build_command() -> Command {
     Command::new("BBL Parser")
         .version(env!("CARGO_PKG_VERSION"))
-        .about("Read and parse BBL blackbox log files. Output to various formats.")
+        .about("Read and parse BBL blackbox log files. Exports to CSV by default (optionally GPX/JSON).")
         .arg(
             Arg::new("files")
                 .help("BBL files to parse (.BBL, .BFL, .TXT extensions supported, case-insensitive, supports globbing)")
@@ -275,16 +275,10 @@ fn build_command() -> Command {
                 .help("Enable debug output and detailed parsing information")
                 .action(clap::ArgAction::SetTrue),
         )
-        .arg(
-            Arg::new("csv")
-                .long("csv")
-                .help("Export decoded frame data to CSV files (creates .XX.csv for flight data and .XX.headers.csv for plaintext headers)")
-                .action(clap::ArgAction::SetTrue),
-        )
         .arg(
             Arg::new("output-dir")
                 .long("output-dir")
-                .help("Directory for CSV output files (default: same as input file)")
+                .help("Directory for output files (default: same as input file)")
                 .value_name("DIR"),
         )
         .arg(
@@ -317,7 +311,6 @@ fn main() -> Result<()> {
     let matches = build_command().get_matches();
 
     let debug = matches.get_flag("debug");
-    let export_csv = matches.get_flag("csv");
     let export_gpx = matches.get_flag("gpx") || matches.get_flag("gps");
     let export_event = matches.get_flag("event");
     let force_export = matches.get_flag("force-export");
@@ -335,7 +328,7 @@ fn main() -> Result<()> {
     };
 
     let export_options = ExportOptions {
-        csv: export_csv,
+        csv: true, // CSV export is always enabled for the CLI binary
         gpx: export_gpx,
         event: export_event,
         output_dir: output_dir.clone(),
@@ -468,11 +461,6 @@ fn main() -> Result<()> {
         std::process::exit(1);
     }
 
-    // Inform user when no output files were created due to missing --csv flag
-    if processed_files > 0 && !export_csv && !export_gpx && !export_event {
-        println!("\nNote: No output files were created. Use --csv to export data to CSV files.");
-    }
-
     Ok(())
 }