P0-1: Map bad-key tags for get/set/delete + smokes; String substring clamp smoke; P0-2: Bridge no‑op(Method) + Gate‑C invalid header smokes; P1: v1 bridge Closure captures appended to argv

lang/src/shared/common/common_imports.hako

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+// CommonImportsBox - Unified import utilities for string operations
+// Consolidates frequently used StringHelpers and StringOps imports
+
+using "lang/src/shared/common/string_helpers.hako" as StringHelpers
+using selfhost.shared.common.string_ops as StringOps
+
+static box CommonImportsBox {
+  // Provides access to common string utilities
+  // Boxes can import this instead of individual modules
+  static helpers() { return StringHelpers }
+  static ops() { return StringOps }
+  
+  // Commonly used string operations
+  static read_digits(text, pos) { return StringHelpers.read_digits(text, pos) }
+  static to_i64(digits) { return StringHelpers.to_i64(digits) }
+  static index_of_from(text, pattern, start) { return StringOps.index_of_from(text, pattern, start) }
+  static substring(text, start, end) { return StringOps.substring(text, start, end) }
+}

lang/src/shared/common/entry_point_base.hako

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+// EntryPointBaseBox - Common entry point for standalone boxes
+// Eliminates repetitive main(args){ return 0 } boilerplate
+
+static box EntryPointBaseBox {
+  // Standard entry point implementation
+  // Can be overridden by specific boxes if needed
+  static main(args) {
+    return 0
+  }
+  
+  // Entry point with validation
+  static safe_main(args) {
+    if args == null {
+      return 1
+    }
+    return EntryPointBaseBox.main(args)
+  }
+}