feat(config,app): embedding provider=ollama 배선 + endpoint, version 0.26.0

kebab-config: EmbeddingModelCfg.endpoint: Option<String>(serde default, ollama용,
None→models.llm.endpoint 폴백) + provider 문서에 ollama + env
KEBAB_MODELS_EMBEDDING_ENDPOINT. kebab-app embedder(): provider match 에 ollama
분기(facade 경유). workspace member += kebab-embed-ollama, app dep 추가.
version 0.25.0 → 0.26.0(minor, +Cargo.lock) — 신규 임베딩 백엔드/모델은 CLAUDE.md
§Release 의 surface 변경 트리거.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Cargo.toml

@@ -12,6 +12,7 @@ members = [
     "crates/kebab-embed",
     "crates/kebab-embed-local",
     "crates/kebab-embed-candle",
+    "crates/kebab-embed-ollama",
     "crates/kebab-llm",
     "crates/kebab-llm-local",
     "crates/kebab-rag",
@@ -31,7 +32,7 @@ edition       = "2024"
 rust-version  = "1.85"
 license       = "MIT OR Apache-2.0"
 repository    = "https://github.com/altair823/kebab"
-version       = "0.25.0"   # v0.25.0 — doc-side expansion(별칭) 기능 완전 제거: Chunk.aliases / expansion.rs / IngestExpansionCfg / alias lexical arm / expansion_progress wire kind 제거, 신규 마이그레이션 V013 이 chunk_aliases_fts + chunks.aliases DROP. AssetTimings.expansion_ms 는 wire 호환 위해 값 0 유지. 별칭 default-off 였어 사용자 체감 0. — CLAUDE.md §Release
+version       = "0.26.0"   # v0.26.0 — arctic-embed-l-v2.0 임베더 통합: kebab-embed-candle 다중 모델 레지스트리(e5 mean + arctic CLS, 모델별 pooling/prefix 분기) + 신규 kebab-embed-ollama 크레이트(provider="ollama", POST /api/embed, L2 정규화, batch+fail-soft). config models.embedding.provider 에 "ollama" 추가 + endpoint: Option<String>. 기본 동작 불변(provider=fastembed e5), arctic 은 opt-in, embedding_version cascade(arctic-cls / ollama:{model} 태그). — CLAUDE.md §Release
 
 # pre-v0.18 workspace-wide cleanup: enable clippy::pedantic group with
 # intentional allow-list. The allowed lints are either cosmetic (doc style),