feat(config): config 디렉터리 기반 설정 관리 (--config-path/--env-file, trex-orb-v1 정합, BAT-026)

REQ-048/010 change-req. `--config` 를 이름으로 해석 + `--config-path <dir>`
(기본 ./config) + resolve_config_toml(슬래시 포함 값은 하위호환 명시 경로).
`.env` 를 config-dir 결정적 해석(--env-file 우선, 없으면 <config_dir>/.env,
CWD 무관) + config/.env.example + .gitignore config/* 허용목록. 운영자 CLI 도
--config-path/--env-file 동일 적용. from_env() legacy 루트 .env 폴백 유지로
완전 하위호환.

단위 23 + 전체 375 passed, ruff clean, 라이브 스모크(name·path 동일).
REQ-048/010 → Implemented.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

docs/batches/index.md

@@ -33,3 +33,4 @@
 | BAT-023 | standard | released | REQ-017 (CHG-20260608-02), REQ-019 (CHG-20260608-02), REQ-029 (CHG-20260608-01), REQ-030 (CHG-20260608-01, Approved→Implemented) | dcy-018 | [bat-023](./bat-023_20260608_ledger-cash-position-writeback-option-d/) |
 | BAT-024 | batch-lite | release-candidate | REQ-032 (CHG-20260609-01) | dcy-016 (issue #17) | [bat-024](./bat-024_20260609_operator-enter-forced-close-at/) |
 | BAT-025 | standard | release-candidate | REQ-002 (CHG-20260609-01), REQ-003 (CHG-20260609-01), REQ-006 (CHG-20260609-01), REQ-007 (CHG-20260609-01), REQ-009 (CHG-20260609-01) | dcy-019 (issue #18) | [bat-025](./bat-025_20260609_slot-entry-count-and-closed-reallocation/) |
+| BAT-026 | batch-lite | release-candidate | REQ-048 (CHG-20260609-01), REQ-010 (CHG-20260609-01) | 없음 (trex-orb-v1 정합) | [bat-026](./bat-026_20260609_config-dir-env-and-config-path/) |