Enhance LLDB support and debugging documentation

- Enhance development shell by including `lldb` in `flake.nix`
- Update `README.md` with LLDB debugging instructions for `day01`

README.md

@@ -29,3 +29,26 @@ zig build install_all -Doptimize=ReleaseSmall # or
 
 hyperfine -r 50 './zig-out/bin/day01'
 ```
+
+## debugging
+
+```sh
+LLDB_DEBUGSERVER_PATH=/Applications/Xcode.app/Contents/SharedFrameworks/LLDB.framework/Versions/A/Resources/debugserver lldb zig-out/bin/day01                                               ✔  9.107s   󱄅  20.11.1   16:24:49 
+(lldb) target create "zig-out/bin/day01"
+Current executable set to '/Users/d438477/devel/github.com/thekorn/aoc-2024-zig/zig-out/bin/day01' (arm64).
+(lldb) breakpoint set -f day01.zig -l 76
+Breakpoint 1: where = day01`day01.main + 40 at day01.zig:76:5, address = 0x0000000100003ad4
+(lldb) r
+Process 53435 launched: '/Users/d438477/devel/github.com/thekorn/aoc-2024-zig/zig-out/bin/day01' (arm64)
+Process 53435 stopped
+* thread #1, queue = 'com.apple.main-thread', stop reason = breakpoint 1.1
+    frame #0: 0x0000000100003ad4 day01`day01.main at day01.zig:76:5
+   73   }
+   74
+   75   pub fn main() !void {
+-> 76       const content = @embedFile("./data/day01.txt");
+   77       const result1 = try part1(content);
+   78       utils.print("Result day 1 - part 1: {any}\n", .{result1});
+   79       const result2 = try part2(content);
+(lldb) ^D
+```

flake.nix

@@ -24,6 +24,7 @@
             zig-overlay.packages.${system}."master-2024-11-30"
             zls-master.packages.${system}.default
 
+            lldb
             hyperfine
           ];
         };