feat(schema): add active_parsers + active_chunkers arrays to schema.v1.models (Bug #13)

이전: schema.v1.models 가 parser_version / chunker_version 단일 값만 보고 →
multi-medium corpus (md + pdf + code Rust/Python + dockerfile + k8s + manifest)
의 version cascade audit 누락 risk.

이후: additive minor — Models struct 에 active_parsers + active_chunkers Vec<String>
추가. backward compat: 기존 단일 field 보존 (markdown default), 신규 array 는
optional (#[serde(default)] + JSON schema required 미포함).

source:
- kebab_store_sqlite::fetch_distinct_parser_versions() 가
  documents.parser_version DISTINCT + ORDER BY 반환.
- fetch_distinct_chunker_versions() 가 chunks.chunker_version 동일 pattern.
- collect_models 가 매 schema 호출마다 재계산 (cache 없음 — R-3 자동 해결).

wire schema additive only — 메이저 bump 불필요. v0.20.1 minor 로 충분.
integrations/claude-code/kebab/SKILL.md 동기 갱신.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

crates/kebab-app/tests/schema_active_versions.rs

@@ -0,0 +1,64 @@
+//! Integration tests for Bug #13: schema.v1.models.active_parsers + active_chunkers.
+
+use kebab_app::schema_with_config;
+use kebab_config::Config;
+use kebab_core::SourceScope;
+
+fn minimal_config(data_dir: &std::path::Path, workspace_root: &std::path::Path) -> Config {
+    let mut cfg = Config::defaults();
+    cfg.workspace.root = workspace_root.to_string_lossy().into_owned();
+    cfg.workspace.exclude.clear();
+    cfg.storage.data_dir = data_dir.to_string_lossy().into_owned();
+    cfg.storage.model_dir = data_dir.join("models").to_string_lossy().into_owned();
+    cfg.models.embedding.provider = "none".to_string();
+    cfg.models.embedding.dimensions = 0;
+    cfg.chunking.target_tokens = 80;
+    cfg.chunking.overlap_tokens = 20;
+    cfg
+}
+
+fn minimal_scope(workspace_root: &std::path::Path) -> SourceScope {
+    SourceScope {
+        root: workspace_root.to_path_buf(),
+        include: vec![],
+        exclude: vec![],
+    }
+}
+
+#[test]
+fn schema_models_active_arrays_empty_on_empty_corpus() {
+    let dir = tempfile::tempdir().unwrap();
+    let workspace = dir.path().join("kb");
+    std::fs::create_dir_all(&workspace).unwrap();
+    let cfg = minimal_config(dir.path(), &workspace);
+
+    let store = kebab_store_sqlite::SqliteStore::open(&cfg).unwrap();
+    store.run_migrations().unwrap();
+    drop(store);
+
+    let s = schema_with_config(&cfg).unwrap();
+    assert!(s.models.active_parsers.is_empty(), "empty corpus → no parsers");
+    assert!(s.models.active_chunkers.is_empty(), "empty corpus → no chunkers");
+    // backward compat: 기존 단일 field 는 markdown default 보존.
+    assert_eq!(s.models.parser_version, kebab_parse_md::PARSER_VERSION);
+}
+
+#[test]
+fn schema_emits_active_parsers_and_chunkers_array_after_ingest() {
+    let dir = tempfile::tempdir().unwrap();
+    let workspace = dir.path().join("kb");
+    std::fs::create_dir_all(&workspace).unwrap();
+    std::fs::write(workspace.join("a.md"), "# A\nhello world\n").unwrap();
+    let cfg = minimal_config(dir.path(), &workspace);
+    let scope = minimal_scope(&workspace);
+
+    kebab_app::ingest_with_config(cfg.clone(), scope, false).unwrap();
+
+    let s = schema_with_config(&cfg).unwrap();
+    assert!(!s.models.active_parsers.is_empty(), "active_parsers populated after ingest");
+    assert!(!s.models.active_chunkers.is_empty(), "active_chunkers populated after ingest");
+    // active arrays must be sorted (ORDER BY in SQL).
+    let mut sorted = s.models.active_parsers.clone();
+    sorted.sort();
+    assert_eq!(s.models.active_parsers, sorted, "active_parsers must be sorted");
+}