feat(docker): add Docker context detection, rootless support, and context-aware buildx registry handling

ts/interfaces/index.ts

@@ -79,6 +79,7 @@ export interface IBuildCommandOptions {
   noCache?: boolean;    // Force rebuild without Docker layer cache (--no-cache)
   cached?: boolean;     // Skip builds when Dockerfile content hasn't changed
   verbose?: boolean;    // Stream raw docker build output (default: silent)
+  context?: string;      // Explicit Docker context name (--context flag)
 }
 
 export interface ICacheEntry {
@@ -92,3 +93,10 @@ export interface ICacheData {
   version: 1;
   entries: { [cleanTag: string]: ICacheEntry };
 }
+
+export interface IDockerContextInfo {
+  name: string;          // 'default', 'rootless', 'colima', etc.
+  endpoint: string;      // 'unix:///var/run/docker.sock'
+  isRootless: boolean;
+  dockerHost?: string;   // value of DOCKER_HOST env var, if set
+}