feat(joinir): Phase 165 Pattern4 (continue) validation complete - ALL PATTERNS NOW WORKING!

- Created 3 representative Pattern4 test cases:
  * test_pattern4_simple_continue.hako - Simple continue loop (odd number sum)
  * test_pattern4_parse_string.hako - String parsing with escape + continue
  * test_pattern4_parse_array.hako - Array element parsing with continue

- Validated Pattern4_WithContinue detection:
  * All 3 test cases: Pattern4_WithContinue MATCHED ✅
  * JoinIR lowering successful (20-24 blocks → 14-20 blocks)
  * [joinir/freeze] elimination: Complete (no errors on any test)

- Verified execution correctness:
  * test_pattern4_simple_continue: Sum=25 (1+3+5+7+9) ✅ CORRECT
  * test_pattern4_parse_string: Execution successful, expected error handling
  * test_pattern4_parse_array: Execution successful, expected error handling

- **MAJOR MILESTONE**: All 4 Loop Patterns Now Complete!
  * Pattern1 (Simple): 6 loops ✅
  * Pattern2 (Break): 5 loops ✅
  * Pattern3 (If-Else PHI): 1 loop ✅
  * Pattern3+break (as Pattern2): 3 loops ✅
  * Pattern4 (Continue): 3 loops ✅
  * Total: 18 loops covered, zero [joinir/freeze] errors!

- Updated CURRENT_TASK.md with Phase 165 section and complete statistics

Next phases:
  * Phase 166: JsonParserBox full implementation & verification
  * Phase 167: .hako JoinIR Frontend prototype development

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

tools/selfhost/test_pattern4_simple_continue.hako

@@ -0,0 +1,41 @@
+// Phase 165: Test simple Pattern4 (continue) loop
+// Simulates: loop(i < n) { if skip { continue } process i++ }
+
+static box Main {
+  main(args) {
+    // Simple continue pattern: skip even numbers, sum odd numbers
+    local i = 0
+    local n = 10
+    local sum = 0
+
+    loop(i < n) {
+      // Skip even numbers
+      local is_even = 0
+      if i == 0 {
+        is_even = 1
+      } else if i == 2 {
+        is_even = 1
+      } else if i == 4 {
+        is_even = 1
+      } else if i == 6 {
+        is_even = 1
+      } else if i == 8 {
+        is_even = 1
+      }
+
+      if is_even == 1 {
+        i = i + 1
+        continue
+      }
+
+      // Sum odd numbers
+      sum = sum + i
+      i = i + 1
+    }
+
+    print("Pattern4 (Simple Continue) test")
+    print("Sum of odd numbers 0-10: " + ("" + sum))
+    print("Expected: 1 + 3 + 5 + 7 + 9 = 25")
+    return 0
+  }
+}