feat: DSL parser, eval system, and project structure

- Hand-written lexer + recursive-descent parser for .kap package definitions
- Package constructs: const, license, provides, outputs, patches, depends
  (version-constrained, feature-gated, output-targeted), features (enabled/
  forced/flag), config files (default/replace/merge with cfg interpolation),
  env (?= soft-set), prepare/build/check/install phases
- Evaluator: recursive  resolver for prefix, jobopts, destdir, userargs,
  cfg.*, feature.*, package vars
- Comments: // single-line, /* */ multi-line
- /kappa/{bin,temp,db,system,system/builds} path layout
- Clang 22, C++23, CMake + vcpkg (tomlplusplus)
- .clangd + .clang-tidy configured

package.toml

@@ -0,0 +1,14 @@
+[package]
+name = "binutils"
+version = "2.46.1"
+description = "GNU Binary Utilities (ld, as, objdump, readelf)"
+
+[source]
+url = "https://ftp.gnu.org/gnu/${name}/${name}-${version}.tar.xz"           # ${} is string substitution
+sha256 = "e127a709cba24c76de8936cb7083dd768f28cd37eb010492e2f19b71eb1294e4" # or sha512, or md5
+
+[dependencies]
+deps = ["zlib", "gettext"]
+
+[build]
+system = "autotools" # or cargo, make, cmake, or meson