Add Nix configuration parser and option extraction

Introduce rnix dependency to parse Nix files and collect boolean options
with their full attribute paths from a test configuration file

Cargo.lock

@@ -8,6 +8,12 @@ version = "0.2.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "683d7910e743518b0e34f1186f92494becacb047c7b6bf616c96772180fef923"
 
+[[package]]
+name = "autocfg"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c08606f8c3cbf4ce6ec8e28fb0014a2c086708fe954eaa885384a6165172e7e8"
+
 [[package]]
 name = "bitflags"
 version = "2.10.0"
@@ -58,6 +64,12 @@ dependencies = [
  "unicode-segmentation",
 ]
 
+[[package]]
+name = "countme"
+version = "3.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7704b5fdd17b18ae31c4c1da5a2e0305a2bf17b5249300a9ee9ed7b72114c636"
+
 [[package]]
 name = "crossterm"
 version = "0.28.1"
@@ -206,8 +218,15 @@ version = "0.1.0"
 dependencies = [
  "crossterm 0.29.0",
  "ratatui",
+ "rnix",
 ]
 
+[[package]]
+name = "hashbrown"
+version = "0.14.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e5274423e17b7c9fc20b6e7e208532f9b19825d82dfd615708b70edd83df41f1"
+
 [[package]]
 name = "hashbrown"
 version = "0.15.5"
@@ -313,7 +332,16 @@ version = "0.12.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "234cf4f4a04dc1f57e24b96cc0cd600cf2af460d4161ac5ecdd0af8e1f3b2a38"
 dependencies = [
- "hashbrown",
+ "hashbrown 0.15.5",
+]
+
+[[package]]
+name = "memoffset"
+version = "0.9.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "488016bfae457b036d996092f6cb448677611ce4449e970ceaf42695203f218a"
+dependencies = [
+ "autocfg",
 ]
 
 [[package]]
@@ -405,6 +433,34 @@ dependencies = [
  "bitflags",
 ]
 
+[[package]]
+name = "rnix"
+version = "0.12.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6f15e00b0ab43abd70d50b6f8cd021290028f9b7fdd7cdfa6c35997173bc1ba9"
+dependencies = [
+ "rowan",
+]
+
+[[package]]
+name = "rowan"
+version = "0.15.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d4f1e4a001f863f41ea8d0e6a0c34b356d5b733db50dadab3efef640bafb779b"
+dependencies = [
+ "countme",
+ "hashbrown 0.14.5",
+ "memoffset",
+ "rustc-hash",
+ "text-size",
+]
+
+[[package]]
+name = "rustc-hash"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "08d43f7aa6b08d49f382cde6a7982047c3426db949b1424bc4b7ec9ae12c6ce2"
+
 [[package]]
 name = "rustix"
 version = "0.38.44"
@@ -530,6 +586,12 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "text-size"
+version = "1.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f18aa187839b2bdb1ad2fa35ead8c4c2976b64e4363c386d45ac0f7ee85c9233"
+
 [[package]]
 name = "unicode-ident"
 version = "1.0.22"