restructure: rsnix kernel + shell crate + rsdos entry point

Architecture:
  rs-dos/  (workspace root, was raisernics/)
  ├── rsnix/     — kernel lib crate (uefi, serial, gop, ps2, interrupts, memory)
  ├── shell/     — shell lib crate (prompt, commands, line input)
  ├── rsdos/     — binary crate (efi_main, init, panic handler)
  └── rsboot/    — future git submodule

No functional changes — boots to shell prompt identically.
Version auto-pulled from Cargo.toml via env!("CARGO_PKG_VERSION").

1 files changed, 5 insertions, 8 deletions

diff --git a/Cargo.toml b/Cargo.toml
index d88efe3..14eaeff 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,10 +1,7 @@
-[package]
-name = "raisernics"
+[workspace]
+resolver = "2"
+members = ["rsnix", "shell", "rsdos"]
+
+[workspace.package]
 version = "0.2.0"
 edition = "2021"
-
-[profile.release]
-lto = true
-codegen-units = 1
-strip = "symbols"
-opt-level = "z"