Initial implementation of arca, a LUKS volume manager.

Go CLI using cobra with mount, unmount, status, and init subcommands.
Unlocks via udisks2 D-Bus (passphrase/keyfile) or cryptsetup (FIDO2/TPM2)
with ordered method fallback. Includes NixOS-specific LD_LIBRARY_PATH
injection for systemd cryptsetup token plugins.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

go.mod

@@ -0,0 +1,16 @@
+module git.wntrmute.dev/kyle/arca
+
+go 1.25.7
+
+require (
+	github.com/godbus/dbus/v5 v5.2.2
+	github.com/spf13/cobra v1.10.2
+	golang.org/x/term v0.41.0
+	gopkg.in/yaml.v3 v3.0.1
+)
+
+require (
+	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/spf13/pflag v1.0.9 // indirect
+	golang.org/x/sys v0.42.0 // indirect
+)