reorg: move input-protocol to library/protocol + direct import

input-protocol -> library/protocol/input/input-protocol.zig. Its five
consumers (usb-hid keyboard/mouse, ps2 keyboard/mouse, the input service) now
import the module directly and alias it input_protocol, replacing the
runtime.input_protocol re-export (deleted) and the inconsistent local `protocol`
aliases. runtime.input (the client) still imports the module by name.

zig build + test green; input, acpi-ps2, usb-hid pass.

system/drivers/ps2-bus/keyboard.zig

@@ -21,7 +21,7 @@ const ps2 = @import("ps2-library.zig");
 const scancode = @import("scancode.zig");
 const device = runtime.device;
 const ipc = runtime.ipc;
-const protocol = runtime.input_protocol;
+const input_protocol = @import("input-protocol");
 
 /// Look up the ps2-bus service, retrying while the bus (which spawned us before
 /// registering) is still coming up.
@@ -46,7 +46,7 @@ fn characterFor(layout: *const xkb.Layout, usage: u8, modifiers: scancode.Modifi
         .control = modifiers.control,
     });
     if (mapping.character) |character| return character;
-    return switch (@as(protocol.Keycode, @enumFromInt(usage))) {
+    return switch (@as(input_protocol.Keycode, @enumFromInt(usage))) {
         .enter, .keypad_enter => '\n',
         .tab => '\t',
         .backspace => 0x08,
@@ -58,9 +58,9 @@ fn characterFor(layout: *const xkb.Layout, usage: u8, modifiers: scancode.Modifi
 /// The input protocol's modifier word for a snapshot.
 fn modifierWord(modifiers: scancode.ModifierSnapshot) u32 {
     var word: u32 = 0;
-    if (modifiers.shift) word |= protocol.modifier_shift;
-    if (modifiers.control) word |= protocol.modifier_control;
-    if (modifiers.alt) word |= protocol.modifier_alt;
+    if (modifiers.shift) word |= input_protocol.modifier_shift;
+    if (modifiers.control) word |= input_protocol.modifier_control;
+    if (modifiers.alt) word |= input_protocol.modifier_alt;
     return word;
 }
 
@@ -133,7 +133,7 @@ pub fn main(init: runtime.process.Init) void {
         switch (transition.action) {
             .pressed => {
                 _ = source.publishKeyboardEvent(.{
-                    .kind = @intFromEnum(protocol.EventKind.key_down),
+                    .kind = @intFromEnum(input_protocol.EventKind.key_down),
                     .keycode = key.usage,
                     .character = 0,
                     .modifiers = modifiers,
@@ -141,7 +141,7 @@ pub fn main(init: runtime.process.Init) void {
                 const character = characterFor(layout, key.usage, transition.modifiers);
                 if (character != 0) {
                     _ = source.publishKeyboardEvent(.{
-                        .kind = @intFromEnum(protocol.EventKind.key_press),
+                        .kind = @intFromEnum(input_protocol.EventKind.key_press),
                         .keycode = key.usage,
                         .character = character,
                         .modifiers = modifiers,
@@ -154,7 +154,7 @@ pub fn main(init: runtime.process.Init) void {
                 const character = characterFor(layout, key.usage, transition.modifiers);
                 if (character != 0) {
                     _ = source.publishKeyboardEvent(.{
-                        .kind = @intFromEnum(protocol.EventKind.key_press),
+                        .kind = @intFromEnum(input_protocol.EventKind.key_press),
                         .keycode = key.usage,
                         .character = character,
                         .modifiers = modifiers,
@@ -163,7 +163,7 @@ pub fn main(init: runtime.process.Init) void {
             },
             .released => {
                 _ = source.publishKeyboardEvent(.{
-                    .kind = @intFromEnum(protocol.EventKind.key_up),
+                    .kind = @intFromEnum(input_protocol.EventKind.key_up),
                     .keycode = key.usage,
                     .character = 0,
                     .modifiers = modifiers,

system/drivers/ps2-bus/mouse.zig

@@ -20,7 +20,7 @@ const ps2 = @import("ps2-library.zig");
 const mouse_packet = @import("mouse-packet.zig");
 const device = runtime.device;
 const ipc = runtime.ipc;
-const protocol = runtime.input_protocol;
+const input_protocol = @import("input-protocol");
 
 /// Look up the ps2-bus service, retrying while the bus (which spawned us before
 /// registering) is still coming up.
@@ -36,9 +36,9 @@ fn lookupBus() ?ipc.Handle {
 /// The protocol's pressed-button bitmask for a packet.
 fn buttonMask(packet: mouse_packet.Packet) u32 {
     var mask: u32 = 0;
-    if (packet.left) mask |= protocol.mouse_button_left;
-    if (packet.right) mask |= protocol.mouse_button_right;
-    if (packet.middle) mask |= protocol.mouse_button_middle;
+    if (packet.left) mask |= input_protocol.mouse_button_left;
+    if (packet.right) mask |= input_protocol.mouse_button_right;
+    if (packet.middle) mask |= input_protocol.mouse_button_middle;
     return mask;
 }
 
@@ -104,9 +104,9 @@ pub fn main(init: runtime.process.Init) void {
 
         // A button transition per changed button, carrying the new whole mask.
         const changed = buttons ^ new_buttons;
-        for ([_]u32{ protocol.mouse_button_left, protocol.mouse_button_right, protocol.mouse_button_middle }) |button| {
+        for ([_]u32{ input_protocol.mouse_button_left, input_protocol.mouse_button_right, input_protocol.mouse_button_middle }) |button| {
             if (changed & button == 0) continue;
-            const kind: protocol.MouseEventKind = if (new_buttons & button != 0) .button_down else .button_up;
+            const kind: input_protocol.MouseEventKind = if (new_buttons & button != 0) .button_down else .button_up;
             _ = source.publishMouseEvent(.{
                 .kind = @intFromEnum(kind),
                 .button = button,
@@ -121,7 +121,7 @@ pub fn main(init: runtime.process.Init) void {
 
         if (packet.dx != 0 or packet.dy != 0) {
             _ = source.publishMouseEvent(.{
-                .kind = @intFromEnum(protocol.MouseEventKind.motion),
+                .kind = @intFromEnum(input_protocol.MouseEventKind.motion),
                 .button = 0,
                 .dx = packet.dx,
                 .dy = packet.dy,

system/drivers/usb-hid/keyboard.zig

@@ -22,7 +22,7 @@ const xkb = @import("xkeyboard-config");
 const hid = @import("hid-report.zig");
 const ipc = runtime.ipc;
 const process = runtime.process;
-const input_protocol = runtime.input_protocol;
+const input_protocol = @import("input-protocol");
 
 // The modifier state a character lookup needs — derived from the report's
 // modifier byte, plus the driver-tracked caps-lock toggle.

system/drivers/usb-hid/mouse.zig

@@ -17,7 +17,7 @@ const usb_abi = @import("usb-abi");
 const hid = @import("hid-report.zig");
 const ipc = runtime.ipc;
 const process = runtime.process;
-const input_protocol = runtime.input_protocol;
+const input_protocol = @import("input-protocol");
 
 // The current pressed-button bitmask in input-protocol terms.
 fn buttonMask(buttons: u8) u32 {