Adopt mcp-kit 0.3 and delete shared implementations

PROJECT.md

@@ -15,7 +15,8 @@ MIT licensed.
   fetch (`fetch.rs`), Markdown sections (`markdown.rs`), tree-sitter symbol
   extraction for TypeScript, Python, Rust and Go (`extract.rs`), BM25
   (`bm25.rs`), the per-version index cache (`index.rs`), and the three queries
-  (`query.rs`)
+  (`query.rs`), and embedding policy (`semantic.rs`, with the engine and
+  tokenizer from `sylphx-mcp-kit` 0.3)
 - `crates/lockdocs`: the `lockdocs` binary (CLI, MCP stdio server, `setup`)
 - `packages/lockdocs`: the npm launcher; `packages/npm/*`: native binaries
 - `bench/`: version-sensitive questions, project pins, and the runner

crates/lockdocs-core/Cargo.toml

@@ -24,7 +24,7 @@ tree-sitter-rust = "0.24"
 ureq = "3"
 flate2 = "1"
 tar = "0.4"
-sha2 = "0.11"
+sylphx-mcp-kit = { version = "0.3", default-features = false, features = ["embed", "search"] }
 zip = { version = "8", default-features = false, features = ["deflate-flate2-zlib-rs"] }
 
 [dev-dependencies]

crates/lockdocs-core/src/cache.rs

@@ -4,10 +4,7 @@ use std::path::PathBuf;
 
 /// `LOCKDOCS_CACHE`, else the OS cache directory, else a temp dir.
 pub fn dir() -> PathBuf {
-    if let Some(p) = std::env::var_os("LOCKDOCS_CACHE").filter(|p| !p.is_empty()) {
-        return PathBuf::from(p);
-    }
-    dirs::cache_dir().unwrap_or_else(std::env::temp_dir).join("lockdocs")
+    mcp_kit::cache::root("LOCKDOCS_CACHE", "lockdocs", mcp_kit::cache::Fallback::Temp, mcp_kit::cache::Override::NonEmpty).expect("temporary cache fallback")
 }
 
 /// FNV-1a 64: stable across builds and platforms.