feat(stage-b): Add FLOW keyword support + fix Stage-3 keyword conflicts

## ✅ Fixed Issues

### 1. `local` keyword tokenization (commit 9aab64f7)
- Added Stage-3 gate for LOCAL/TRY/CATCH/THROW keywords
- LOCAL now only active when NYASH_PARSER_STAGE3=1

### 2. `env.local.get` keyword conflict
- File: `lang/src/compiler/entry/compiler_stageb.hako:21-23`
- Problem: `.local` in member access tokenized as `.LOCAL` keyword
- Fix: Commented out `env.local.get("HAKO_SOURCE")` line
- Fallback: Use `--source` argument (still functional)

### 3. `flow` keyword missing
- Added FLOW to TokenType enum (`src/tokenizer/kinds.rs`)
- Added "flow" → TokenType::FLOW mapping (`src/tokenizer/lex_ident.rs`)
- Added FLOW to Stage-3 gate (requires NYASH_PARSER_STAGE3=1)
- Added FLOW to parser statement dispatch (`src/parser/statements/mod.rs`)
- Added FLOW to declaration handler (`src/parser/statements/declarations.rs`)
- Updated box_declaration parser to accept BOX or FLOW (`src/parser/declarations/box_definition.rs`)
- Treat `flow FooBox {}` as syntactic sugar for `box FooBox {}`

### 4. Module namespace conversion
- Renamed `lang.compiler.builder.ssa.local` → `localvar` (avoid keyword)
- Renamed file `local.hako` → `local_ssa.hako`
- Converted 152 path-based using statements to namespace format
- Added 26+ entries to `nyash.toml` [modules] section

## ⚠️ Remaining Issues

### Stage-B selfhost compiler performance
- Stage-B compiler not producing output (hangs/times out after 10+ seconds)
- Excessive PHI debug output suggests compilation loop issue
- Needs investigation: infinite loop or N² algorithm in hako compiler

### Fallback JSON version mismatch
- Rust fallback (`--emit-mir-json`) emits MIR v1 JSON (schema_version: "1.0")
- Smoke tests expect MIR v0 JSON (`"version":0, "kind":"Program"`)
- stageb_helpers.sh fallback needs adjustment

## Test Status
- Parse errors: FIXED ✅
- Keyword conflicts: FIXED ✅
- Stage-B smoke tests: STILL FAILING ❌ (performance issue)

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

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

lang/src/compiler/builder/mod.hako

@@ -1,8 +1,8 @@
 // Moved from apps/selfhost-compiler/builder/mod.hako
 // builder/mod.hako — Aggregator for compiler-track passes (scaffold)
 
-using lang.compiler.builder.ssa.local as LocalSSA
-using lang.compiler.builder.ssa.loop as LoopSSA
+using lang.compiler.builder.ssa.localvar as LocalSSA
+using lang.compiler.builder.ssa.loopssa as LoopSSA
 using lang.compiler.builder.rewrite.special as RewriteSpecial
 using lang.compiler.builder.rewrite.known as RewriteKnown
 

lang/src/compiler/builder/ssa/cond_inserter.hako

@@ -1,7 +1,7 @@
 // cond_inserter.hako — minimal JSON-string helper to ensure branch(cond) has copy
 // Scope: smoke/dev helper（文字列JSON限定、構造的なLocalSSAとは別ライン）
 
-using "lang/src/shared/json/json_cursor.hako" as JsonCursorBox
+using selfhost.shared.json.core.json_cursor as JsonCursorBox
 
 static box CondInserter {
   ensure_cond(mjson) {

lang/src/compiler/builder/ssa/local_ssa.hako

@@ -4,7 +4,7 @@
 //   「ブロック内にオペランドが材化されている（LocalSSA）」ことを軽く検証・整形する。
 // - 既定では再配線（Copy挿入）等は行わず、将来の拡張に備えた安全な足場のみを提供する。
 
-using "lang/src/shared/common/string_helpers.hako" as StringHelpers
+using selfhost.shared.common.string_helpers as StringHelpers
 static box LocalSSA {
   // --- 内部ヘルパ ---
   // trace fields are created on demand (dynamic properties)

lang/src/compiler/emit/common/call_emit_box.hako

@@ -4,7 +4,7 @@
 // - Args are expected as an ArrayBox of integer register ids.
 // - Callers may optionally attach  (string like "[1,2]") for legacy rebuild paths.
 
-using "lang/src/shared/common/string_helpers.hako" as StringHelpers
+using selfhost.shared.common.string_helpers as StringHelpers
 
 static box CallEmitBox {
   make_call(name, arg_ids, dst) {

lang/src/compiler/emit/common/newbox_emit_box.hako

@@ -1,6 +1,6 @@
 // newbox_emit_box.hako — NewBoxEmitBox: construct MIR(JSON v0) node for newbox
 // Responsibility: return MapBox node for { op: newbox, box_type, args, dst }.
-using "lang/src/shared/json/stringify.hako" as JSON
+using selfhost.shared.json.stringify as JSON
 
 static box NewBoxEmitBox {
   make_new(box_type, arg_ids, dst) {

lang/src/compiler/emit/mir_emitter_box.hako

@@ -3,8 +3,8 @@
 // Future: add Binary/Compare/ExternCall/BoxCall lowering incrementally.
 
 using selfhost.common.json.mir_builder_min as MirJsonBuilderMin
-using "lang/src/shared/json/stringify.hako" as JSON
-using "lang/src/shared/common/string_helpers.hako" as StringHelpers
+using selfhost.shared.json.stringify as JSON
+using selfhost.shared.common.string_helpers as StringHelpers
 
 static box MirEmitterBox {
   _index_of(hay, needle) { return hay.indexOf(needle) }

lang/src/compiler/entry/compiler.hako

@@ -2,7 +2,7 @@
 // - When invoked with --min-json, emit minimal Program JSON v0 to stdout
 // - Otherwise, act as a silent placeholder (return 0)
 
-using "lang/src/compiler/entry/compiler_stageb.hako" as StageBMain
+using lang.compiler.entry.compiler_stageb as StageBMain
 
 static box Main {
   _parse_signed_int(raw) {

lang/src/compiler/entry/compiler_stageb.hako

@@ -18,7 +18,8 @@ static box StageBMain {
         i = i + 1
       }
     }
-    if src == null { src = env.local.get("HAKO_SOURCE") }
+    // Skip env.local.get check - Stage-3 keyword conflict
+    // Original: if src == null { src = env.local.get("HAKO_SOURCE") }
     if src == null { src = "return 0" }
 
     // 2) Stage‑3 acceptance default ON for selfhost (env may turn off; keep tolerant here)
@@ -72,7 +73,7 @@ static box StageBMain {
     local prefer = 1
     local out = FlowEntryBox.emit_v0_from_ast_with_context(ast_json, prefer, usings_json, null, externs_json)
     if out == null || out == "" { out = FlowEntryBox.emit_v0_from_ast(ast_json, prefer) }
-    if out == null || out == "" { out = "{\"version\":0,\"kind\":\"Program\",\"body\":[{\"type\":\"Return\",\"expr\":{\"type\":\"Int\",\"value\":0}}]}" }
+    // TTL OFF: do not fallback to dummy JSON when emit fails. Empty output surfaces failure to caller.
     print(out)
     return 0
   }

lang/src/compiler/hako_module.toml

@@ -27,7 +27,7 @@ pipeline_v2.pipeline = "pipeline_v2/pipeline.hako"
 pipeline_v2.using_resolver = "pipeline_v2/using_resolver_box.hako"
 
 # Builder / SSA / Rewrite (scaffolds)
-builder.ssa.local = "builder/ssa/local.hako"
+builder.ssa.local = "builder/ssa/local_ssa.hako"
 builder.ssa.loop = "builder/ssa/loopssa.hako"
 builder.ssa.cond_inserter = "builder/ssa/cond_inserter.hako"
 builder.rewrite.special = "builder/rewrite/special.hako"

lang/src/compiler/pipeline_v2/alias_preflight_box.hako

@@ -4,8 +4,8 @@
 // Behavior: If dotted, verify alias head is known; otherwise print a stable one-line error and return 0.
 // Non‑Responsibility: Namespace normalization or emit.
 
-using "lang/src/compiler/pipeline_v2/using_resolver_box.hako" as UsingResolverBox
-using "lang/src/compiler/pipeline_v2/regex_flow.hako" as RegexFlow
+using lang.compiler.pipeline_v2.using_resolver_box as UsingResolverBox
+using lang.compiler.pipeline_v2.regex_flow as RegexFlow
 
 static box AliasPreflightBox {
   // Returns 1 if OK, 0 if alias head is unresolved (prints error).

lang/src/compiler/pipeline_v2/call_extract_box.hako

@@ -1,6 +1,6 @@
 // CallExtractBox — Stage‑1 JSON から Return(Call name(args...)) を抽出（整数引数のみ）
 // Delegation to Stage1IntArgsExtractBox (unified implementation)
-using "lang/src/compiler/pipeline_v2/stage1_int_args_extract_box.hako" as Unified
+using lang.compiler.pipeline_v2.stage1_int_args_extract_box as Unified
 
 static box CallExtractBox {
   // Returns { name: String, args: [Int,...] } or null

lang/src/compiler/pipeline_v2/compare_extract_box.hako

@@ -1,6 +1,6 @@
 // CompareExtractBox — Stage‑1 JSON から Compare(lhs,rhs,op) を堅牢に抽出（整数のみ）
-using "lang/src/compiler/pipeline_v2/regex_flow.hako" as RegexFlow
-using "lang/src/shared/common/box_helpers.hako" as BoxHelpers
+using lang.compiler.pipeline_v2.regex_flow as RegexFlow
+using selfhost.shared.common.box_helpers as BoxHelpers
 
 static box CompareExtractBox {
   // --- internal helpers (range & safe find) ---

lang/src/compiler/pipeline_v2/emit_binop_box.hako

@@ -1,5 +1,5 @@
 // EmitBinopBox — binop の最小 MIR(JSON v0) 生成
-using "lang/src/shared/json/mir_builder_min.hako" as MirJsonBuilderMin
+using selfhost.shared.json.mir_builder_min as MirJsonBuilderMin
 
 static box EmitBinopBox {
   _map_binop(opk) {

lang/src/compiler/pipeline_v2/emit_call_box.hako

@@ -1,9 +1,9 @@
 // EmitCallBox — Return(Call name(int_args...)) を MIR(JSON v0) に最小変換
 // 仕様: 各引数を const i64 として材化し、call を発行、dst を ret する。
 
-using "lang/src/compiler/pipeline_v2/regex_flow.hako" as RegexFlow
+using lang.compiler.pipeline_v2.regex_flow as RegexFlow
 using lang.compiler.emit.common.header_emit as HeaderEmitBox
-using "lang/src/shared/mir/mir_schema_box.hako" as MirSchemaBox
+using selfhost.shared.mir.schema as MirSchemaBox
 
 static box EmitCallBox {
   _to_str(n) {

lang/src/compiler/pipeline_v2/emit_compare_box.hako

@@ -1,5 +1,5 @@
 // EmitCompareBox — compare/branch/jump/ret の最小 MIR(JSON v0) 生成（string直組み）
-using "lang/src/compiler/pipeline_v2/local_ssa_box.hako" as LocalSSABox
+using lang.compiler.pipeline_v2.localvar_ssa_box as LocalSSABox
 using lang.compiler.emit.common.mir_emit as MirEmitBox
 using lang.compiler.emit.common.header_emit as HeaderEmitBox
 

lang/src/compiler/pipeline_v2/emit_method_box.hako

@@ -1,9 +1,9 @@
 // EmitMethodBox — Return(Method recv, method, args[int...]) → MIR(JSON v0)
 // 最小形: const recv→r1; 各引数を r2..rN; boxcall(method, recv=r1, args=r2..) → rK; ret rK
 
-using "lang/src/compiler/pipeline_v2/regex_flow.hako" as RegexFlow
+using lang.compiler.pipeline_v2.regex_flow as RegexFlow
 using lang.compiler.emit.common.header_emit as HeaderEmitBox
-using "lang/src/shared/mir/mir_schema_box.hako" as MirSchemaBox
+using selfhost.shared.mir.schema as MirSchemaBox
 
 static box EmitMethodBox {
   _to_str(n) {

lang/src/compiler/pipeline_v2/emit_mir_flow.hako

@@ -1,9 +1,9 @@
-using "lang/src/shared/mir/json_emit_box.hako" as JsonEmitBox
+using selfhost.shared.mir.json_emit as JsonEmitBox
 // Shared MIR helpers (P1/P2)
-using "lang/src/shared/mir/mir_schema_box.hako" as MirSchema
-using "lang/src/shared/mir/block_builder_box.hako" as BlockBuilder
-using "lang/src/compiler/pipeline_v2/local_ssa_box.hako" as LocalSSABox
-using "lang/src/shared/common/box_helpers.hako" as BoxHelpers
+using selfhost.shared.mir.schema as MirSchema
+using selfhost.shared.mir.builder as BlockBuilder
+using lang.compiler.pipeline_v2.localvar_ssa_box as LocalSSABox
+using selfhost.shared.common.box_helpers as BoxHelpers
 
 flow EmitMirFlow {
   _int(n) { return "" + n }

lang/src/compiler/pipeline_v2/emit_mir_flow_map.hako

@@ -1,9 +1,9 @@
-using "lang/src/shared/mir/json_emit_box.hako" as JsonEmitBox
+using selfhost.shared.mir.json_emit as JsonEmitBox
 // Shared MIR helpers (P1)
-using "lang/src/shared/mir/mir_schema_box.hako" as MirSchema
-using "lang/src/shared/mir/block_builder_box.hako" as BlockBuilder
-using "lang/src/shared/common/box_helpers.hako" as BoxHelpers
-using "lang/src/compiler/pipeline_v2/local_ssa_box.hako" as LocalSSABox
+using selfhost.shared.mir.schema as MirSchema
+using selfhost.shared.mir.builder as BlockBuilder
+using selfhost.shared.common.box_helpers as BoxHelpers
+using lang.compiler.pipeline_v2.localvar_ssa_box as LocalSSABox
 
 flow EmitMirFlowMap {
   _array_len(arr) { return BoxHelpers.array_len(arr) }

lang/src/compiler/pipeline_v2/emit_newbox_box.hako

@@ -1,12 +1,12 @@
 // EmitNewBoxBox — Return(New class, args[int...]) → MIR(JSON v0)
 // 最小形: 各引数を r1..rN; newbox(class, args=r1..rN) → rK; ret rK
 
-using "lang/src/shared/json/mir_builder_min.hako" as MirJsonBuilderMin
-using "lang/src/compiler/pipeline_v2/regex_flow.hako" as RegexFlow
-using "lang/src/compiler/pipeline_v2/stage1_args_parser_box.hako" as Stage1ArgsParserBox
-using "lang/src/shared/mir/json_emit_box.hako" as JsonEmitBox
-using "lang/src/shared/mir/block_builder_box.hako" as BlockBuilder
-using "lang/src/compiler/pipeline_v2/local_ssa_box.hako" as LocalSSABox
+using selfhost.shared.json.mir_builder_min as MirJsonBuilderMin
+using lang.compiler.pipeline_v2.regex_flow as RegexFlow
+using lang.compiler.pipeline_v2.stage1_args_parser_box as Stage1ArgsParserBox
+using selfhost.shared.mir.json_emit as JsonEmitBox
+using selfhost.shared.mir.builder as BlockBuilder
+using lang.compiler.pipeline_v2.localvar_ssa_box as LocalSSABox
 
 static box EmitNewBoxBox {
   emit_newbox_int_args(class_name, args) {

lang/src/compiler/pipeline_v2/execution_pipeline_box.hako

@@ -14,7 +14,7 @@ using lang.compiler.parser.stmt.parser_control_box
 using lang.compiler.parser.stmt.parser_exception_box
 using lang.compiler.stage1.json_program_box
 using lang.compiler.stage1.emitter_box as EmitterBoxMod
-using "lang/src/compiler/pipeline_v2/backend_box.hako" as BackendBoxMod
+using lang.compiler.pipeline_v2.backend_box as BackendBoxMod
 
 box ExecutionPipelineBox {
   backend_name

lang/src/compiler/pipeline_v2/flow_entry.hako

@@ -1,8 +1,8 @@
 // flow_entry.hako — Pipeline v2 entry box（emit-only）
 // Guard: This box performs no execution. Returns MIR(JSON) as text.
 
-using "lang/src/compiler/pipeline_v2/pipeline.hako" as PipelineV2
-using "lang/src/shared/json/mir_v1_adapter.hako" as MirJsonV1Adapter
+using lang.compiler.pipeline_v2.pipeline as PipelineV2
+using selfhost.shared.json.mir_v1_adapter as MirJsonV1Adapter
 
 static box FlowEntryBox {
   // Emit legacy v0 JSON（call/boxcall/newbox）。最小入力: Stage‑1 JSON 文字列

lang/src/compiler/pipeline_v2/local_ssa_box.hako

@@ -1,7 +1,7 @@
 // LocalSSABox — 材化（materialize）/Copy 挿入の最小ポリシーを集約
 // Phase 15.7: 最小実装。将来 PHI/Call 前の規約をここに集約して拡張する。
 
-using "lang/src/shared/common/box_helpers.hako" as BoxHelpers
+using selfhost.shared.common.box_helpers as BoxHelpers
 
 static box LocalSSABox {
   _maybe_unwrap_instructions(insts) {

lang/src/compiler/pipeline_v2/map_helpers_box.hako

@@ -1,7 +1,7 @@
 // map_helpers_box.hako — Pipeline用の軽量ヘルパ（MapBoxの型付き取得）
 
-using "lang/src/shared/common/string_helpers.hako" as StringHelpers
-using "lang/src/shared/common/box_helpers.hako" as BoxHelpers
+using selfhost.shared.common.string_helpers as StringHelpers
+using selfhost.shared.common.box_helpers as BoxHelpers
 static box MapHelpersBox {
   _raw_get(m, key) {
     return BoxHelpers.map_get(m, key)

lang/src/compiler/pipeline_v2/method_extract_box.hako

@@ -1,6 +1,6 @@
 // MethodExtractBox — Stage‑1 JSON から Return(Method recv, method, args) を抽出（整数引数のみ; recvは無視）
 // Delegation to Stage1IntArgsExtractBox (unified implementation)
-using "lang/src/compiler/pipeline_v2/stage1_int_args_extract_box.hako" as Unified
+using lang.compiler.pipeline_v2.stage1_int_args_extract_box as Unified
 
 static box MethodExtractBox {
   // Returns { method: String, args: [Int,...] } or null

lang/src/compiler/pipeline_v2/mir_builder_box.hako

@@ -1,10 +1,10 @@
 // MirBuilderBox — minimal Ny→MIR(JSON v0) lowering entry (dev)
 // Phase 15.7: kept optional; pipeline.v2 uses Emit flow directly.
-using "lang/src/compiler/pipeline_v2/stage1_extract_flow.hako" as Stage1ExtractFlow
-using "lang/src/compiler/pipeline_v2/emit_return_box.hako" as EmitReturnBox
-using "lang/src/compiler/pipeline_v2/emit_binop_box.hako" as EmitBinopBox
-using "lang/src/compiler/pipeline_v2/emit_compare_box.hako" as EmitCompareBox
-using "lang/src/shared/common/box_helpers.hako" as BoxHelpers
+using lang.compiler.pipeline_v2.stage1_extract_flow as Stage1ExtractFlow
+using lang.compiler.pipeline_v2.emit_return_box as EmitReturnBox
+using lang.compiler.pipeline_v2.emit_binop_box as EmitBinopBox
+using lang.compiler.pipeline_v2.emit_compare_box as EmitCompareBox
+using selfhost.shared.common.box_helpers as BoxHelpers
 
 box MirBuilderBox {
   // Placeholder for optimizer toggle

lang/src/compiler/pipeline_v2/mir_call_box.hako

@@ -1,12 +1,12 @@
 // MirCallBox — JSON v1 unified call emitters（薄い箱）
 // 目的: v1（mir_call）を第一級に扱う最小APIを集中させる。実行は含まない（emit-only）。
 
-using "lang/src/shared/json/mir_builder_min.hako" as MirJsonBuilderMin
-using "lang/src/compiler/pipeline_v2/regex_flow.hako" as RegexFlow
+using selfhost.shared.json.mir_builder_min as MirJsonBuilderMin
+using lang.compiler.pipeline_v2.regex_flow as RegexFlow
 using lang.compiler.emit.common.mir_emit as MirEmitBox
 using lang.compiler.emit.common.call_emit as CallEmitBox
 using lang.compiler.emit.common.header_emit as HeaderEmitBox
-using "lang/src/shared/mir/json_emit_box.hako" as JsonEmitBox
+using selfhost.shared.mir.json_emit as JsonEmitBox
 
 static box MirCallBox {
   // Global(name, args:int[])

lang/src/compiler/pipeline_v2/name_resolve_box.hako

@@ -3,9 +3,9 @@
 // - primary: NamespaceBox.normalize_global_name(raw, resolver)
 // - fallback: unique tail match via UsingResolverBox.guess_namespace_from_tail
 
-using "lang/src/compiler/pipeline_v2/using_resolver_box.hako" as UsingResolverBox
-using "lang/src/compiler/pipeline_v2/namespace_box.hako" as NamespaceBox
-using "lang/src/compiler/pipeline_v2/regex_flow.hako" as RegexFlow
+using lang.compiler.pipeline_v2.using_resolver_box as UsingResolverBox
+using lang.compiler.pipeline_v2.namespace_box as NamespaceBox
+using lang.compiler.pipeline_v2.regex_flow as RegexFlow
 
 static box PipelineNameResolveBox {
   // Returns fully-qualified name or null

lang/src/compiler/pipeline_v2/namespace_box.hako

@@ -5,8 +5,8 @@
 // Non‑Responsibility:
 // - IO / TOML 読み込み、Runner 側の using 解決、実行
 
-using "lang/src/compiler/pipeline_v2/using_resolver_box.hako" as UsingResolver
-using "lang/src/compiler/pipeline_v2/regex_flow.hako" as RegexFlow
+using lang.compiler.pipeline_v2.using_resolver_box as UsingResolver
+using lang.compiler.pipeline_v2.regex_flow as RegexFlow
 
 static box NamespaceBox {
   // Normalize global function name using resolver context

lang/src/compiler/pipeline_v2/new_extract_box.hako

@@ -1,6 +1,6 @@
 // NewExtractBox — Stage‑1 JSON から Return(New class(args...)) を抽出（整数引数のみ）
 // Delegation to Stage1IntArgsExtractBox (unified implementation)
-using "lang/src/compiler/pipeline_v2/stage1_int_args_extract_box.hako" as Unified
+using lang.compiler.pipeline_v2.stage1_int_args_extract_box as Unified
 
 static box NewExtractBox {
   // Returns { class: String, args: [Int,...] } or null

lang/src/compiler/pipeline_v2/normalizer_box.hako

@@ -1,7 +1,7 @@
 // normalizer_box.hako — Minimal normalizer for Compare maps (cmp/lhs/rhs)
 
-using "lang/src/shared/common/string_helpers.hako" as StringHelpers
-using "lang/src/shared/common/box_helpers.hako" as BoxHelpers
+using selfhost.shared.common.string_helpers as StringHelpers
+using selfhost.shared.common.box_helpers as BoxHelpers
 static box NormalizerBox {
   // Normalize cmp/lhs/rhs into MapBox with String keys
   normalize_cmp(raw) {

lang/src/compiler/pipeline_v2/pipeline.hako

@@ -1,30 +1,30 @@
-using "lang/src/compiler/pipeline_v2/stage1_extract_flow.hako" as Stage1ExtractFlow
-using "lang/src/compiler/pipeline_v2/emit_return_box.hako" as EmitReturnBox
-using "lang/src/compiler/pipeline_v2/emit_binop_box.hako" as EmitBinopBox
-using "lang/src/compiler/pipeline_v2/emit_compare_box.hako" as EmitCompareBox
-using "lang/src/compiler/pipeline_v2/regex_flow.hako" as RegexFlow
-using lang.compiler.builder.ssa.local as LocalSSA
-using "lang/src/compiler/pipeline_v2/emit_call_box.hako" as EmitCallBox
-using "lang/src/compiler/pipeline_v2/emit_method_box.hako" as EmitMethodBox
-using "lang/src/compiler/pipeline_v2/emit_newbox_box.hako" as EmitNewBoxBox
-using "lang/src/compiler/pipeline_v2/mir_call_box.hako" as MirCallBox
-using "lang/src/shared/json/mir_v1_adapter.hako" as MirJsonV1Adapter
-using "lang/src/compiler/pipeline_v2/compare_extract_box.hako" as CompareExtractBox
-using "lang/src/compiler/pipeline_v2/normalizer_box.hako" as NormalizerBox
-using "lang/src/compiler/pipeline_v2/map_helpers_box.hako" as MapHelpersBox
-using "lang/src/compiler/pipeline_v2/call_extract_box.hako" as CallExtractBox
-using "lang/src/compiler/pipeline_v2/method_extract_box.hako" as MethodExtractBox
-using "lang/src/compiler/pipeline_v2/new_extract_box.hako" as NewExtractBox
-using "lang/src/shared/common/string_helpers.hako" as StringHelpers
-using "lang/src/compiler/pipeline_v2/using_resolver_box.hako" as UsingResolverBox
-using "lang/src/compiler/pipeline_v2/namespace_box.hako" as NamespaceBox
-using "lang/src/compiler/pipeline_v2/signature_verifier_box.hako" as SignatureVerifierBox
-using "lang/src/compiler/pipeline_v2/stage1_json_scanner_box.hako" as Stage1JsonScannerBox
-using "lang/src/compiler/pipeline_v2/stage1_name_args_normalizer_box.hako" as NameArgsNormBox
-using "lang/src/compiler/pipeline_v2/alias_preflight_box.hako" as AliasPreflightBox
-using "lang/src/compiler/pipeline_v2/stage1_args_parser_box.hako" as Stage1ArgsParserBox
-using "lang/src/compiler/pipeline_v2/pipeline_helpers_box.hako" as PipelineHelpersBox
-using "lang/src/shared/json/mir_v1_meta_inject_box.hako" as MirV1MetaInjectBox
+using lang.compiler.pipeline_v2.stage1_extract_flow as Stage1ExtractFlow
+using lang.compiler.pipeline_v2.emit_return_box as EmitReturnBox
+using lang.compiler.pipeline_v2.emit_binop_box as EmitBinopBox
+using lang.compiler.pipeline_v2.emit_compare_box as EmitCompareBox
+using lang.compiler.pipeline_v2.regex_flow as RegexFlow
+using lang.compiler.builder.ssa.localvar as LocalSSA
+using lang.compiler.pipeline_v2.emit_call_box as EmitCallBox
+using lang.compiler.pipeline_v2.emit_method_box as EmitMethodBox
+using lang.compiler.pipeline_v2.emit_newbox_box as EmitNewBoxBox
+using lang.compiler.pipeline_v2.mir_call_box as MirCallBox
+using selfhost.shared.json.mir_v1_adapter as MirJsonV1Adapter
+using lang.compiler.pipeline_v2.compare_extract_box as CompareExtractBox
+using lang.compiler.pipeline_v2.normalizer_box as NormalizerBox
+using lang.compiler.pipeline_v2.map_helpers_box as MapHelpersBox
+using lang.compiler.pipeline_v2.call_extract_box as CallExtractBox
+using lang.compiler.pipeline_v2.method_extract_box as MethodExtractBox
+using lang.compiler.pipeline_v2.new_extract_box as NewExtractBox
+using sh_core as StringHelpers
+using lang.compiler.pipeline_v2.using_resolver_box as UsingResolverBox
+using lang.compiler.pipeline_v2.namespace_box as NamespaceBox
+using lang.compiler.pipeline_v2.signature_verifier_box as SignatureVerifierBox
+using lang.compiler.pipeline_v2.stage1_json_scanner_box as Stage1JsonScannerBox
+using lang.compiler.pipeline_v2.stage1_name_args_normalizer_box as NameArgsNormBox
+using lang.compiler.pipeline_v2.alias_preflight_box as AliasPreflightBox
+using lang.compiler.pipeline_v2.stage1_args_parser_box as Stage1ArgsParserBox
+using lang.compiler.pipeline_v2.pipeline_helpers_box as PipelineHelpersBox
+using selfhost.shared.json.mir_v1_meta_inject_box as MirV1MetaInjectBox
 
 flow PipelineV2 {
   lower_stage1_to_mir(ast_json, prefer_cfg) {

lang/src/compiler/pipeline_v2/pipeline_emit_box.hako

@@ -1,9 +1,9 @@
 // pipeline_emit_box.hako — PipelineEmitBox
 // Responsibility: small wrappers that emit MIR(JSON v0) and apply LocalSSA ensures
 
-using "lang/src/compiler/pipeline_v2/emit_call_box.hako" as EmitCallBox
-using "lang/src/compiler/pipeline_v2/local_ssa_box.hako" as LocalSSABox
-using "lang/src/shared/json/mir_v1_meta_inject_box.hako" as MirV1MetaInjectBox
+using lang.compiler.pipeline_v2.emit_call_box as EmitCallBox
+using lang.compiler.pipeline_v2.localvar_ssa_box as LocalSSABox
+using selfhost.shared.json.mir_v1_meta_inject_box as MirV1MetaInjectBox
 
 static box PipelineEmitBox {
   // Emit Call(name, int-args) → JSON v0, wrapped with LocalSSA ensures

lang/src/compiler/pipeline_v2/pipeline_helpers_box.hako

@@ -2,8 +2,8 @@
 // 責務: JSON/数値解析の共通ユーティリティ
 // Extracted from PipelineV2 flow (556行 → 506行、-50行削減)
 
-using "lang/src/compiler/pipeline_v2/regex_flow.hako" as RegexFlow
-using "lang/src/shared/common/string_helpers.hako" as StringHelpers
+using lang.compiler.pipeline_v2.regex_flow as RegexFlow
+using selfhost.shared.common.string_helpers as StringHelpers
 
 static box PipelineHelpersBox {
   // Parse integer at specific position (whitespace-aware, sign-aware)

lang/src/compiler/pipeline_v2/readonly_map_view.hako

@@ -1,6 +1,6 @@
 // readonly_map_view.hako — 読み取り専用ビュー（誤更新防止用）
 
-using "lang/src/shared/common/box_helpers.hako" as BoxHelpers
+using selfhost.shared.common.box_helpers as BoxHelpers
 
 static box ReadOnlyMapView {
   _m

lang/src/compiler/pipeline_v2/regex_flow.hako

@@ -1,4 +1,4 @@
-using "lang/src/shared/common/string_helpers.hako" as StringHelpers
+using selfhost.shared.common.string_helpers as StringHelpers
 
 flow RegexFlow {
   // Minimal regex-like helpers focused on readability and determinism.

lang/src/compiler/pipeline_v2/signature_verifier_box.hako

@@ -6,7 +6,7 @@
 //   (e.g., indexOf=1 on String/Array, push=1 on Array, etc.).
 // - Unknown methods are allowed (return 1) to avoid over-blocking during bring-up.
 
-using "lang/src/compiler/pipeline_v2/regex_flow.hako" as RegexFlow
+using lang.compiler.pipeline_v2.regex_flow as RegexFlow
 // Method registry is optional; allow unknowns by design in bring-up.
 
 static box SignatureVerifierBox {

lang/src/compiler/pipeline_v2/stage1_args_parser_box.hako

@@ -2,8 +2,8 @@
 // Responsibility: Parse Stage‑1 args JSON text into integers (MVP: Int only).
 // Non‑Responsibility: MIR emit or namespace.
 
-using "lang/src/compiler/pipeline_v2/regex_flow.hako" as RegexFlow
-using "lang/src/shared/json/json_cursor.hako" as JsonCursorBox
+using lang.compiler.pipeline_v2.regex_flow as RegexFlow
+using selfhost.shared.json.core.json_cursor as JsonCursorBox
 
 static box Stage1ArgsParserBox {
   // Count Int occurrences in Stage‑1 args JSON text.

lang/src/compiler/pipeline_v2/stage1_extract_flow.hako

@@ -1,4 +1,4 @@
-using "lang/src/compiler/pipeline_v2/regex_flow.hako" as RegexFlow
+using lang.compiler.pipeline_v2.regex_flow as RegexFlow
 
 flow Stage1ExtractFlow {
   // Extract minimal info from Stage‑1 JSON (Return Int / BinOp / Compare)

lang/src/compiler/pipeline_v2/stage1_int_args_extract_box.hako

@@ -2,7 +2,7 @@
 // Responsibility: 3つの類似ExtractBoxを統合（call_extract/method_extract/new_extract）
 // Notes: 85%重複コードを共通化、args抽出ロジックを一元管理
 
-using "lang/src/compiler/pipeline_v2/regex_flow.hako" as RegexFlow
+using lang.compiler.pipeline_v2.regex_flow as RegexFlow
 
 static box Stage1IntArgsExtractBox {
   // ===== 汎用Extract（内部実装） =====

lang/src/compiler/pipeline_v2/stage1_json_scanner_box.hako

@@ -6,8 +6,8 @@
 // - name/args basic extraction
 // Non‑Responsibility: MIR emit, namespace resolution, IO
 
-using "lang/src/shared/json/json_cursor.hako" as JsonCursorBox
-using "lang/src/shared/common/box_helpers.hako" as BoxHelpers
+using selfhost.shared.json.core.json_cursor as JsonCursorBox
+using selfhost.shared.common.box_helpers as BoxHelpers
 
 static box Stage1JsonScannerBox {
   // Find the start position of Program.body array key

lang/src/compiler/pipeline_v2/stage1_name_args_normalizer_box.hako

@@ -5,10 +5,10 @@
 //  - New: class normalization via UsingResolverBox/NamespaceBox
 // Non‑Responsibility: MIR emit or IO
 
-using "lang/src/compiler/pipeline_v2/namespace_box.hako" as NamespaceBox
-using "lang/src/compiler/pipeline_v2/signature_verifier_box.hako" as SignatureVerifierBox
-using "lang/src/compiler/pipeline_v2/alias_preflight_box.hako" as AliasPreflightBox
-using "lang/src/shared/common/box_helpers.hako" as BoxHelpers
+using lang.compiler.pipeline_v2.namespace_box as NamespaceBox
+using lang.compiler.pipeline_v2.signature_verifier_box as SignatureVerifierBox
+using lang.compiler.pipeline_v2.alias_preflight_box as AliasPreflightBox
+using selfhost.shared.common.box_helpers as BoxHelpers
 
 static box Stage1NameArgsNormalizerBox {
   _label_or_name(scan) {

lang/src/compiler/pipeline_v2/terminator_guard_box.hako

@@ -2,7 +2,7 @@
 // Responsibility: Provide a thin, unified guard to prevent emit after terminator.
 // Notes: Operates on an instructions ArrayBox of Map nodes with key "op".
 
-using "lang/src/shared/common/box_helpers.hako" as BoxHelpers
+using selfhost.shared.common.box_helpers as BoxHelpers
 
 static box TerminatorGuardBox {
   // Return 1 if the given instructions array ends with ret/throw

lang/src/compiler/pipeline_v2/using_resolver_box.hako

@@ -4,9 +4,9 @@
 //   modules_map: Map, modules_keys: Array
 // }
 
-using "lang/src/shared/common/string_helpers.hako" as StringHelpers
-using "lang/src/shared/common/box_helpers.hako" as BoxHelpers
-using "lang/src/compiler/pipeline_v2/regex_flow.hako" as RegexFlow
+using selfhost.shared.common.string_helpers as StringHelpers
+using selfhost.shared.common.box_helpers as BoxHelpers
+using lang.compiler.pipeline_v2.regex_flow as RegexFlow
 
 static box UsingResolverBox {
   // Lightweight state as String: holds modules_json only

lang/src/compiler/stage1/emitter_box.hako

@@ -1,6 +1,6 @@
 // Moved from apps/selfhost-compiler/boxes/emitter_box.hako
 // EmitterBox — thin wrapper to emit JSON v0 (extracted)
-using "lang/src/compiler/stage1/json_program_box.hako" as JsonProg
+using lang.compiler.stage1.json_program_box as JsonProg
 
 static box EmitterBox {
   emit_program(json, usings_json, externs_json) {

lang/src/compiler/stage1/json_program_box.hako

@@ -1,8 +1,8 @@
 // Moved from apps/selfhost-compiler/boxes/json_program_box.hako
 // JsonProgramBox — JSON v0 正規化の最小箱
 // 責務: Programヘッダの補正・meta.usings注入・主要Stmt/Exprのキー順安定化
-using "lang/src/shared/common/string_helpers.hako" as StringHelpers
-using "lang/src/shared/json/json_utils.hako" as JsonUtilsBox
+using selfhost.shared.common.string_helpers as StringHelpers
+using selfhost.shared.json.utils.json_utils as JsonUtilsBox
 
 static box JsonProgramBox {
   normalize(json, usings_json, externs_json) {