refactor(rename): kb crates → kebab — Cargo packages, folders, Rust modules

프로젝트 이름 `kb` → `kebab` rename 의 첫 단계.

- workspace `Cargo.toml`: members `crates/kb-*` → `crates/kebab-*`,
  repository URL `altair823/kb` → `altair823/kebab`.
- 18 crate 폴더 rename via `git mv` (history 보존).
- 각 crate `Cargo.toml`: `name = "kb-*"` → `"kebab-*"`, path deps
  `../kb-*` → `../kebab-*`.
- 모든 `.rs`: `kb_<id>` snake-case 모듈 path 18 개 (`kb_core`,
  `kb_config`, `kb_app`, `kb_cli`, `kb_eval`, `kb_search`, `kb_chunk`,
  `kb_normalize`, `kb_source_fs`, `kb_parse_md`, `kb_parse_types`,
  `kb_store_sqlite`, `kb_store_vector`, `kb_embed`, `kb_embed_local`,
  `kb_llm`, `kb_llm_local`, `kb_rag`) → `kebab_<id>` 일괄 sed (단어
  경계 \\b 사용해 영어 문장 안의 "kb" 약어 미오염).

CLI binary 이름 (`[[bin]] name = "kb"`), 환경변수 `KB_*`, XDG paths,
tracing target, 그리고 docs sweep 은 다음 commit 에서.

## 검증

- `cargo check --workspace` clean — 모든 crate 빌드 통과 후 commit.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

crates/kebab-store-sqlite/snapshots/ingest_report.snapshot.json

@@ -0,0 +1,47 @@
+{
+  "duration_ms": 187,
+  "errors": 0,
+  "items": [
+    {
+      "asset_id": "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
+      "block_count": 7,
+      "byte_len": 1234,
+      "chunk_count": 3,
+      "chunker_version": "md-heading-v1",
+      "doc_id": "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
+      "doc_path": "notes/alpha.md",
+      "error": null,
+      "kind": "new",
+      "parser_version": "pulldown-cmark-0.x",
+      "warnings": []
+    },
+    {
+      "asset_id": "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb",
+      "block_count": 12,
+      "byte_len": 2048,
+      "chunk_count": 5,
+      "chunker_version": "md-heading-v1",
+      "doc_id": "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb",
+      "doc_path": "notes/beta.md",
+      "error": null,
+      "kind": "updated",
+      "parser_version": "pulldown-cmark-0.x",
+      "warnings": [
+        "malformed frontmatter"
+      ]
+    }
+  ],
+  "new": 2,
+  "scanned": 3,
+  "scope": {
+    "exclude": [
+      ".git/**"
+    ],
+    "include": [
+      "**/*.md"
+    ],
+    "root": "/home/u/KB"
+  },
+  "skipped": 0,
+  "updated": 1
+}