feat(joinir): Phase 188 Pattern 1 Core Implementation + Phase 189 Planning

Phase 188 Status: Planning & Foundation Complete (100%)

Completed Tasks:
✅ Task 188-1: Error Inventory (5 patterns identified)
✅ Task 188-2: Pattern Classification (3 patterns selected)
✅ Task 188-3: Design (51KB comprehensive blueprint)
✅ Task 188-4: Implementation Foundation (1,802 lines scaffolding)
✅ Task 188-5: Verification & Documentation
✅ Pattern 1 Core Implementation: Detection + Lowering + Routing

Pattern 1 Implementation (322 lines):
- Pattern Detection: is_simple_while_pattern() in loop_pattern_detection.rs
- JoinIR Lowering: lower_simple_while_to_joinir() in simple_while_minimal.rs (219 lines)
  - Generates 3 functions: entry, loop_step (tail-recursive), k_exit
  - Implements condition negation: exit_cond = !(i < 3)
  - Tail-recursive Call pattern with state propagation
- Routing: Added "main" to function routing list in control_flow.rs
- Build: ✅ SUCCESS (0 errors, 34 warnings)

Infrastructure Blocker Identified:
- merge_joinir_mir_blocks() only handles single-function JoinIR modules
- Pattern 1 generates 3 functions (entry + loop_step + k_exit)
- Current implementation only merges first function → loop body never executes
- Root cause: control_flow.rs line ~850 takes only .next() function

Phase 189 Planning Complete:
- Goal: Refactor merge_joinir_mir_blocks() for multi-function support
- Strategy: Sequential Merge (Option A) - merge all functions in call order
- Effort estimate: 5.5-7.5 hours
- Deliverables: README.md (16KB), current-analysis.md (15KB), QUICKSTART.md (5.8KB)

Files Modified/Created:
- src/mir/loop_pattern_detection.rs (+50 lines) - Pattern detection
- src/mir/join_ir/lowering/simple_while_minimal.rs (+219 lines) - Lowering
- src/mir/join_ir/lowering/loop_patterns.rs (+803 lines) - Foundation skeleton
- src/mir/join_ir/lowering/mod.rs (+2 lines) - Module registration
- src/mir/builder/control_flow.rs (+1 line) - Routing fix
- src/mir/builder/loop_frontend_binding.rs (+20 lines) - Binding updates
- tools/test_phase188_foundation.sh (executable) - Foundation verification
- CURRENT_TASK.md (updated) - Phase 188/189 status

Next: Phase 189 implementation (merge_joinir_mir_blocks refactor)

🤖 Generated with Claude Code

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

tools/test_joinir_freeze_inventory.sh

@@ -0,0 +1,74 @@
+#!/bin/bash
+# Phase 188 Task 188-1: Collect [joinir/freeze] error inventory
+# Run loop tests with JoinIR-only configuration (no LoopBuilder fallback)
+
+set -e
+
+HAKORUNE_BIN="./target/release/hakorune"
+
+# Check if hakorune binary exists
+if [ ! -f "$HAKORUNE_BIN" ]; then
+    echo "Error: $HAKORUNE_BIN not found. Run 'cargo build --release' first."
+    exit 1
+fi
+
+# JoinIR-only configuration
+export NYASH_JOINIR_CORE=1
+export NYASH_LEGACY_LOOPBUILDER=0
+export NYASH_DISABLE_PLUGINS=1
+
+# Test files
+TEST_FILES=(
+    "apps/tests/joinir_if_merge_multiple.hako"
+    "apps/tests/joinir_if_merge_simple.hako"
+    "apps/tests/joinir_if_select_local.hako"
+    "apps/tests/joinir_if_select_simple.hako"
+    "apps/tests/joinir_min_loop.hako"
+    "apps/tests/loop_if_phi.hako"
+    "apps/tests/loop_if_phi_continue.hako"
+    "apps/tests/loop_min_while.hako"
+    "apps/tests/loop_phi_one_sided.hako"
+)
+
+echo "=========================================="
+echo "Phase 188 Task 188-1: JoinIR Error Inventory"
+echo "Configuration:"
+echo "  NYASH_JOINIR_CORE=1"
+echo "  NYASH_LEGACY_LOOPBUILDER=0"
+echo "  NYASH_DISABLE_PLUGINS=1"
+echo "=========================================="
+echo ""
+
+TOTAL=0
+FAILED=0
+PASSED=0
+
+for test_file in "${TEST_FILES[@]}"; do
+    TOTAL=$((TOTAL + 1))
+    echo "----------------------------------------"
+    echo "[$TOTAL] Testing: $test_file"
+    echo "----------------------------------------"
+
+    if [ ! -f "$test_file" ]; then
+        echo "SKIP: File not found"
+        echo ""
+        continue
+    fi
+
+    # Run test and capture both stdout and stderr
+    if "$HAKORUNE_BIN" "$test_file" 2>&1; then
+        echo "PASS"
+        PASSED=$((PASSED + 1))
+    else
+        echo "FAIL (exit code: $?)"
+        FAILED=$((FAILED + 1))
+    fi
+    echo ""
+done
+
+echo "=========================================="
+echo "Summary:"
+echo "  Total:  $TOTAL"
+echo "  Passed: $PASSED"
+echo "  Failed: $FAILED"
+echo "=========================================="