test(joinir): Phase 182-5 Add P1/P2 pattern verification tests

Phase 182-5 Test Results:
✅ Pattern1 (Simple) - phase182_p1_match_literal.hako PASSES
✅ Pattern2 (Break) - phase182_p2_break_integer.hako PASSES

Verification:
- P1 routes correctly to Pattern1_Minimal
- P2 routes correctly to Pattern2_WithBreak
- Both execute successfully with integer operations
- _match_literal logic verified (string matching with early return)

Blockers for actual JsonParser loops (_parse_number, _atoi):
1. LoopBodyLocal variables (ch, digit_pos, pos) trigger promotion requirement
   - Current system only handles Trim-specific carrier promotion
   - P2 should allow purely local temp variables (not promoted to carriers)
2. String operation filter (Phase 178)
   - Conservatively rejects string concat: num_str = num_str + ch
   - Need gradual enablement for JsonParser use cases

Next steps (Phase 182-6):
- Document blockers and workaround strategies
- Recommend LoopBodyLocal handling improvements for Phase 183+

apps/tests/phase182_p2_break_integer.hako

@@ -0,0 +1,29 @@
+// Phase 182-5: Basic Pattern2 Break test with integers only
+// No string operations, no LoopBodyLocal - pure P2 verification
+
+static box Main {
+  main(args) {
+    // Simple integer accumulation with break (sum of 1+2 = 3)
+    local result = 0
+    local i = 1
+    local limit = 5
+
+    loop(i < limit) {
+      if i == 3 { break }  // Stop before adding 3
+      result = result + i
+      i = i + 1
+    }
+
+    // Expected: result = 1+2 = 3, i = 3
+    // Simple verification without toString()
+    if result == 3 {
+      if i == 3 {
+        print("PASS: P2 Break works correctly")
+        return 0
+      }
+    }
+
+    print("FAIL: result or i incorrect")
+    return 1
+  }
+}