phase29aq(p2): add index_of_string/to_upper stdlib subsets

docs/development/current/main/10-Now.md

@@ -3,7 +3,7 @@
 ## Current Focus
 
 - Phase: `docs/development/current/main/phases/phase-29aq/README.md`
-- Next: Phase 29aq P2 (stdlib scan subset extensions)
+- Next: Phase 29aq P3 (stdlib split/scan derivatives)
 
 ## Gate (SSOT)
 

docs/development/current/main/30-Backlog.md

@@ -5,7 +5,7 @@ Scope: 「次にやる候補」を短く列挙するメモ。入口は `docs/dev
 
 ## Active
 
-- Phase 29aq: `docs/development/current/main/phases/phase-29aq/README.md` (Next: P2 scan subsets)
+- Phase 29aq: `docs/development/current/main/phases/phase-29aq/README.md` (Next: P3 split/scan derivatives)
 - JoinIR regression gate SSOT: `docs/development/current/main/phases/phase-29ae/README.md`
 - CorePlan hardening (docs-first): `docs/development/current/main/phases/phase-29al/README.md`
 

docs/development/current/main/design/coreplan-migration-roadmap-ssot.md

@@ -34,7 +34,7 @@ Related:
 ## 1.1 Current (active)
 
 - Active phase: `docs/development/current/main/phases/phase-29aq/README.md`
-- Next step: Phase 29aq P2 (stdlib scan subset extensions)
+- Next step: Phase 29aq P3 (stdlib split/scan derivatives)
 
 ## 2. すでに固めた SSOT（再発防止の土台）
 

docs/development/current/main/phases/phase-29ae/README.md

@@ -17,8 +17,10 @@ Goal: JoinIR の最小回帰セットを SSOT として固定する。
 - Pattern1 (stdlib join, VM): `phase29ap_stringutils_join_vm`
 - ScanWithInit (stdlib index_of, VM): `phase29aq_string_index_of_min_vm`
 - ScanWithInit (stdlib last_index_of, VM): `phase29aq_string_last_index_of_min_vm`
+- ScanWithInit (stdlib index_of_string, VM): `phase29aq_string_index_of_string_min_vm`
 - Pattern2 (stdlib parse_integer, VM): `phase29aq_string_parse_integer_min_vm`
 - SplitScan (stdlib split, VM): `phase29aq_string_split_min_vm`
+- Pattern1 (stdlib to_upper, VM): `phase29aq_string_to_upper_min_vm`
 - Pattern5 (Break, VM): `phase286_pattern5_break_vm`
 - Pattern5 (strict shadow, VM): `phase29ao_pattern5_strict_shadow_vm`
 - Pattern5 (release adopt, VM): `phase29ao_pattern5_release_adopt_vm`

docs/development/current/main/phases/phase-29aq/P2-INDEXOFSTRING-TOUPPER-SUBSET-INSTRUCTIONS.md

@@ -0,0 +1,58 @@
+---
+Status: Done
+Scope: stdlib subsets (index_of_string, to_upper)
+Related:
+- docs/development/current/main/phases/phase-29aq/README.md
+- docs/development/current/main/phases/phase-29ae/README.md
+---
+
+# Phase 29aq P2: stdlib subsets (index_of_string, to_upper)
+
+Goal: add two stdlib subsets with fixtures and integration smokes, wired to the
+JoinIR regression gate (phase29ae pack).
+
+## P2-1: to_upper (Pattern1CharMap)
+
+Target: `apps/lib/json_native/utils/string.hako`
+
+- loop(i < s.length())
+- local ch = s.substring(i, i + 1)
+- result = result + this.char_to_upper(ch)
+- i = i + 1
+
+Notes:
+- Use existing Pattern1CharMap facts/planner/normalizer path.
+- No new CorePlan vocabulary or logs.
+
+Fixtures/smokes:
+- `apps/tests/phase29aq_string_to_upper_min.hako`
+- `tools/smokes/v2/profiles/integration/joinir/phase29aq_string_to_upper_min_vm.sh`
+
+## P2-2: index_of_string (ScanWithInit dynamic needle)
+
+Target: `apps/lib/json_native/utils/string.hako`
+
+- loop(i <= s.length() - substr.length())
+- if s.substring(i, i + substr.length()) == substr { return i }
+- i = i + 1
+- return -1
+
+Notes:
+- Treat as ScanWithInit with dynamic needle length.
+- Facts must detect the dynamic needle length and forward scan shape.
+
+Fixtures/smokes:
+- `apps/tests/phase29aq_string_index_of_string_min.hako`
+- `tools/smokes/v2/profiles/integration/joinir/phase29aq_string_index_of_string_min_vm.sh`
+
+## Gate wiring (SSOT)
+
+- Add both smokes to `tools/smokes/v2/profiles/integration/joinir/phase29aq_stdlib_pack_vm.sh`.
+- Ensure `phase29ae_regression_pack_vm.sh` runs the stdlib pack.
+- Update `docs/development/current/main/phases/phase-29ae/README.md`.
+
+## Verification
+
+- `cargo build --release`
+- `./tools/smokes/v2/run.sh --profile quick`
+- `./tools/smokes/v2/profiles/integration/joinir/phase29ae_regression_pack_vm.sh`

docs/development/current/main/phases/phase-29aq/README.md

@@ -57,7 +57,8 @@ Plan/Composer subsets (or mark unsupported) before adding new subsets.
 ## Progress
 
 - P1: Add stdlib subsets in priority order (index_of/last_index_of → parse_integer → split).
+- P2: Add stdlib subsets (index_of_string → to_upper).
 
 ## Next (planned)
 
-- P2: Extend stdlib scan subsets (candidate: index_of_string, to_upper).
+- P3: Expand split/scan derivatives (candidate: starts_with/ends_with).