return path.join(canonicalParent, path.basename(filePath));

}

async function expectPathMissing(targetPath: string): Promise<void> {

await expect(fs.stat(targetPath)).rejects.toMatchObject({ code: "ENOENT" });

}

const deriveSessionKeyCases = [

{

name: "returns normalized per-sender key",

const store = loadSessionStore(storePath);

expect(store[mainSessionKey]?.modelOverride).toBe("anthropic/claude-opus-4-6");

expect(store[mainSessionKey]?.thinkingLevel).toBe("high");

await expect(fs.stat(`${storePath}.lock`)).rejects.toThrow();

await expectPathMissing(`${storePath}.lock`);

});

it("updateSessionStoreEntry re-reads disk inside the writer slot instead of using stale cache", async () => {