build: delete module_homes — imports resolve through the declared zon

The module-to-domain table in build-support duplicated what each
domain's build.zig already states with its addModule exports. userBinary
now resolves each named import by searching the packages the binary
declared in its own build.zig.zon (b.available_deps), which also makes
the zon the literal include path: an import can only be satisfied by a
domain the binary claims, and naming a module whose domain is missing
fails the build graph with the domain to declare. build-support is down
to the recipe alone. All build variants green; manifest unchanged.

system/drivers/pci-bus/build.zig

@@ -1,6 +1,6 @@
 //! The pci-bus driver as a binary package (docs/build-packages-plan.md):
 //! this file names the binary and EXACTLY the modules its source imports —
-//! the shared recipe and the module-to-domain map live in build-support.
+//! build-support resolves each name from the domains this zon declares.
 
 const std = @import("std");
 const build_support = @import("build-support");

system/drivers/ps2-bus/build.zig

@@ -1,6 +1,6 @@
 //! The ps2-bus driver as a binary package (docs/build-packages-plan.md):
 //! this file names the binary and EXACTLY the modules its source imports —
-//! the shared recipe and the module-to-domain map live in build-support.
+//! build-support resolves each name from the domains this zon declares.
 
 const std = @import("std");
 const build_support = @import("build-support");

system/drivers/usb-hid/build.zig

@@ -1,6 +1,6 @@
 //! The usb-hid driver as a binary package (docs/build-packages-plan.md):
 //! this file names the binary and EXACTLY the modules its source imports —
-//! the shared recipe and the module-to-domain map live in build-support.
+//! build-support resolves each name from the domains this zon declares.
 
 const std = @import("std");
 const build_support = @import("build-support");

system/drivers/usb-storage/build.zig

@@ -1,6 +1,6 @@
 //! The usb-storage driver as a binary package (docs/build-packages-plan.md):
 //! this file names the binary and EXACTLY the modules its source imports —
-//! the shared recipe and the module-to-domain map live in build-support.
+//! build-support resolves each name from the domains this zon declares.
 
 const std = @import("std");
 const build_support = @import("build-support");

system/drivers/usb-xhci-bus/build.zig

@@ -1,6 +1,6 @@
 //! The usb-xhci-bus driver as a binary package (docs/build-packages-plan.md):
 //! this file names the binary and EXACTLY the modules its source imports —
-//! the shared recipe and the module-to-domain map live in build-support.
+//! build-support resolves each name from the domains this zon declares.
 
 const std = @import("std");
 const build_support = @import("build-support");

system/drivers/virtio-gpu/build.zig

@@ -1,6 +1,6 @@
 //! The virtio-gpu driver as a binary package (docs/build-packages-plan.md):
 //! this file names the binary and EXACTLY the modules its source imports —
-//! the shared recipe and the module-to-domain map live in build-support.
+//! build-support resolves each name from the domains this zon declares.
 
 const std = @import("std");
 const build_support = @import("build-support");

system/services/acpi/build.zig

@@ -1,6 +1,6 @@
 //! The acpi service as a binary package (docs/build-packages-plan.md):
 //! this file names the binary and EXACTLY the modules its source imports —
-//! the shared recipe and the module-to-domain map live in build-support.
+//! build-support resolves each name from the domains this zon declares.
 //!
 //! The artifact is named "discovery": one swappable process per firmware
 //! fills the ramdisk's neutral `discovery` slot (docs/discovery.md); the

system/services/device-manager/build.zig

@@ -1,6 +1,6 @@
 //! The device-manager service as a binary package (docs/build-packages-plan.md):
 //! this file names the binary and EXACTLY the modules its source imports —
-//! the shared recipe and the module-to-domain map live in build-support.
+//! build-support resolves each name from the domains this zon declares.
 
 const std = @import("std");
 const build_support = @import("build-support");

system/services/display-demo/build.zig

@@ -1,6 +1,6 @@
 //! The display-demo service as a binary package (docs/build-packages-plan.md):
 //! this file names the binary and EXACTLY the modules its source imports —
-//! the shared recipe and the module-to-domain map live in build-support.
+//! build-support resolves each name from the domains this zon declares.
 
 const std = @import("std");
 const build_support = @import("build-support");

system/services/display/build.zig

@@ -1,6 +1,6 @@
 //! The display service as a binary package (docs/build-packages-plan.md):
 //! this file names the binary and EXACTLY the modules its source imports —
-//! the shared recipe and the module-to-domain map live in build-support.
+//! build-support resolves each name from the domains this zon declares.
 
 const std = @import("std");
 const build_support = @import("build-support");

system/services/fat/build.zig

@@ -1,6 +1,6 @@
 //! The fat service as a binary package (docs/build-packages-plan.md):
 //! this file names the binary and EXACTLY the modules its source imports —
-//! the shared recipe and the module-to-domain map live in build-support.
+//! build-support resolves each name from the domains this zon declares.
 
 const std = @import("std");
 const build_support = @import("build-support");

system/services/fdt/build.zig

@@ -1,6 +1,6 @@
 //! The fdt service as a binary package (docs/build-packages-plan.md):
 //! this file names the binary and EXACTLY the modules its source imports —
-//! the shared recipe and the module-to-domain map live in build-support.
+//! build-support resolves each name from the domains this zon declares.
 //!
 //! The artifact is named "discovery" like acpi's: the Raspberry Pis hand over
 //! a flattened device tree, and the aarch64 target flips the root's

system/services/init/build.zig

@@ -1,6 +1,6 @@
 //! init (PID 1) as a binary package (docs/build-packages-plan.md): this file
 //! names the binary and EXACTLY the modules its source imports — the shared
-//! recipe and the module-to-domain map live in build-support. The root build
+//! recipe resolves each name from the domains the zon declares. The root build
 //! consumes the artifact for the boot image and forwards its -Dserial here.
 
 const std = @import("std");

system/services/input/build.zig

@@ -1,6 +1,6 @@
 //! The input service as a binary package (docs/build-packages-plan.md):
 //! this file names the binary and EXACTLY the modules its source imports —
-//! the shared recipe and the module-to-domain map live in build-support.
+//! build-support resolves each name from the domains this zon declares.
 
 const std = @import("std");
 const build_support = @import("build-support");