Add entity customer numbers and scope APIs via selected company.

Entity gets an optional unique-per-company number with allocate/peek/isNumberFree helpers. Company-scoped store methods no longer take companyId and resolve google_auth.selected_company instead.

API.brand.md

@@ -10,7 +10,7 @@ Deletes a brand for a company by its id.
 
 ```js
 const fn = del(pool);
-await fn(42, 1, 3);
+await fn(42, 3);
 ```
 
 ## `brand.list`
@@ -21,7 +21,7 @@ Lists the brands of a company.
 
 ```js
 const fn = list(pool);
-const brands = await fn(42, 1);
+const brands = await fn(42);
 // => [{ id, name, gsprpinfo }]
 ```
 
@@ -33,6 +33,6 @@ Creates or updates a brand for a company, keyed by name.
 
 ```js
 const fn = upsert(pool);
-const brand = await fn(42, 1, { name: 'Coca-Cola', gsprpinfo: 'x' });
+const brand = await fn(42, { name: 'Coca-Cola', gsprpinfo: 'x' });
 // => { id, name, gsprpinfo }
 ```