feat(joinir): Phase 164 Pattern3 (If-Else PHI) validation complete

- Created 4 representative test cases for Pattern3 patterns:
  * test_pattern3_if_phi_no_break.hako - Core Pattern3 (if-else PHI, no break/continue)
  * test_pattern3_skip_whitespace.hako - Pattern3+break style (routed to Pattern2)
  * test_pattern3_trim_leading.hako - Pattern3+break style (routed to Pattern2)
  * test_pattern3_trim_trailing.hako - Pattern3+break style (routed to Pattern2)

- Validated Pattern3_WithIfPhi detection:
  * Pattern routing: Pattern3_WithIfPhi MATCHED confirmed
  * JoinIR lowering: 3 functions, 20 blocks → 8 blocks (successful)
  * [joinir/freeze] elimination: Complete (no errors on any test)

- Clarified pattern classification:
  * Pattern3_WithIfPhi handles if-else PHI without break/continue
  * Loops with "if-else PHI + break" are routed to Pattern2_WithBreak
  * Break takes priority over if-else PHI in pattern detection

- Cumulative achievement (Phase 162-164):
  * Pattern1: 6 loops working ✅
  * Pattern2: 5 loops working ✅
  * Pattern3 (no break): 1 loop working ✅
  * Pattern3+break (as Pattern2): 3 loops working ✅
  * Total: 15 loops covered, zero [joinir/freeze] errors

- Updated CURRENT_TASK.md with Phase 164 section and findings

Next: Phase 165 Pattern4 (continue) validation

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

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

tools/selfhost/program_analyze.sh

@@ -0,0 +1,48 @@
+#!/usr/bin/env bash
+# tools/selfhost/program_analyze.sh - Phase 160-impl-1 Program JSON Analyzer wrapper
+#
+# Usage:
+#   ./tools/selfhost/program_analyze.sh /path/to/program.json
+#   ./tools/selfhost/program_analyze.sh < program.json   # stdin
+#
+# This script reads a Program JSON v0 file and passes it to the .hako analyzer
+# for selfhost depth-2 verification (Rust outputs IR → .hako reads IR).
+
+set -euo pipefail
+
+ROOT="$(cd "$(dirname "$0")/../.." && pwd)"
+BIN="${NYASH_BIN:-$ROOT/target/release/hakorune}"
+HAKO="$ROOT/tools/selfhost/program_analyze.hako"
+
+if [ ! -x "$BIN" ]; then
+  echo "[ERROR] hakorune binary not found: $BIN" >&2
+  echo "Run: cargo build --release" >&2
+  exit 2
+fi
+
+if [ ! -f "$HAKO" ]; then
+  echo "[ERROR] program_analyze.hako not found: $HAKO" >&2
+  exit 2
+fi
+
+# Read JSON from file argument or stdin
+if [ $# -ge 1 ] && [ -f "$1" ]; then
+  JSON_CONTENT="$(cat "$1")"
+elif [ ! -t 0 ]; then
+  # Read from stdin
+  JSON_CONTENT="$(cat)"
+else
+  echo "Usage: $0 /path/to/program.json" >&2
+  echo "   or: cat program.json | $0" >&2
+  exit 2
+fi
+
+# Run the .hako analyzer with Program JSON in environment
+export HAKO_PROGRAM_JSON="$JSON_CONTENT"
+export NYASH_FEATURES="${NYASH_FEATURES:-stage3}"
+export NYASH_PARSER_ALLOW_SEMICOLON=1
+export NYASH_USING_AST=1
+export NYASH_QUIET=0
+export HAKO_QUIET=0
+
+exec "$BIN" --backend vm "$HAKO"