refactor(cli): consolidate JSON utilities into io.zig

Move JSON accessor functions to io.zig:
- jsonGetString, jsonGetInt, jsonGetFloat, jsonGetBool
- json.zig now re-exports from io.zig for backward compatibility

Benefits:
- Single location for all I/O related utilities
- Consistent with terminal/color consolidation
- Reduced file count

Build passes successfully.

cli/src/utils/io.zig

@@ -205,3 +205,41 @@ fn writeJSONString(writer: anytype, s: []const u8) !void {
 fn hexDigit(v: u8) u8 {
     return if (v < 10) ('0' + v) else ('a' + (v - 10));
 }
+
+// ============================================================================
+// JSON Object Accessor Utilities
+// ============================================================================
+
+/// Get a string value from a JSON object map
+pub fn jsonGetString(obj: std.json.ObjectMap, key: []const u8) ?[]const u8 {
+    const v = obj.get(key) orelse return null;
+    if (v != .string) return null;
+    return v.string;
+}
+
+/// Get an integer value from a JSON object map
+pub fn jsonGetInt(obj: std.json.ObjectMap, key: []const u8) ?i64 {
+    const v = obj.get(key) orelse return null;
+    switch (v) {
+        .integer => |i| return i,
+        .float => |f| return @intFromFloat(f),
+        else => return null,
+    }
+}
+
+/// Get a float value from a JSON object map
+pub fn jsonGetFloat(obj: std.json.ObjectMap, key: []const u8) ?f64 {
+    const v = obj.get(key) orelse return null;
+    switch (v) {
+        .float => |f| return f,
+        .integer => |i| return @floatFromInt(i),
+        else => return null,
+    }
+}
+
+/// Get a boolean value from a JSON object map
+pub fn jsonGetBool(obj: std.json.ObjectMap, key: []const u8) ?bool {
+    const v = obj.get(key) orelse return null;
+    if (v != .bool) return null;
+    return v.bool;
+}

cli/src/utils/json.zig

@@ -1,35 +1,8 @@
-const std = @import("std");
+/// Re-exports from io.zig for backward compatibility
+/// Use @import("io.zig") directly for new code
+const io = @import("io.zig");
 
-/// Get a string value from a JSON object map
-pub fn getString(obj: std.json.ObjectMap, key: []const u8) ?[]const u8 {
-    const v = obj.get(key) orelse return null;
-    if (v != .string) return null;
-    return v.string;
-}
-
-/// Get an integer value from a JSON object map
-pub fn getInt(obj: std.json.ObjectMap, key: []const u8) ?i64 {
-    const v = obj.get(key) orelse return null;
-    switch (v) {
-        .integer => |i| return i,
-        .float => |f| return @intFromFloat(f),
-        else => return null,
-    }
-}
-
-/// Get a float value from a JSON object map
-pub fn getFloat(obj: std.json.ObjectMap, key: []const u8) ?f64 {
-    const v = obj.get(key) orelse return null;
-    switch (v) {
-        .float => |f| return f,
-        .integer => |i| return @floatFromInt(i),
-        else => return null,
-    }
-}
-
-/// Get a boolean value from a JSON object map
-pub fn getBool(obj: std.json.ObjectMap, key: []const u8) ?bool {
-    const v = obj.get(key) orelse return null;
-    if (v != .bool) return null;
-    return v.bool;
-}
+pub const getString = io.jsonGetString;
+pub const getInt = io.jsonGetInt;
+pub const getFloat = io.jsonGetFloat;
+pub const getBool = io.jsonGetBool;