feat(deps): add lindera + lindera-ko-dic for korean morphological tokenizer

Workspace dependency 만 추가 — 실제 사용은 S3 의 kebab-chunk
tokenize_korean_morphological() helper.

- Cargo.toml (workspace): lindera = "3", lindera-ko-dic = "3" 추가.
- crates/kebab-chunk/Cargo.toml: per-crate dep (lindera-ko-dic 에
  embed-ko-dic feature 로 KO-DIC 딕셔너리 embedded blob 활성화).
- crates/kebab-app/Cargo.toml: [features] 에 fts_korean_morphological
  (spec §6.3 Option A — marker role only, disable path 없음).

License: lindera = MIT, lindera-ko-dic = MIT
(cargo info 로 확인). cargo deny 도입은 P9 follow-up.

Spec: docs/superpowers/specs/2026-05-28-v0.20.x-korean-morphological-tokenizer-spec.md §6.1, §10.1
Plan: docs/superpowers/plans/2026-05-28-v0.20.x-korean-morphological-tokenizer-plan.md (S2)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

crates/kebab-app/Cargo.toml

@@ -89,5 +89,11 @@ lopdf                = { workspace = true }
 # reqwest::Error (private constructor) — built from a connect-refused call.
 reqwest      = { version = "0.12", default-features = false, features = ["blocking", "rustls-tls"] }
 
+[features]
+# Marker feature — spec §6.3 Option A (단순): lindera 는 kebab-chunk 가 default dep 으로 소유.
+# disable path 없음; 이 feature 는 spec §6.3 명시를 honor 하는 role 만.
+default = ["fts_korean_morphological"]
+fts_korean_morphological = []
+
 [lints]
 workspace = true