refactor: derive the release identity from the package name

The supply-chain builder id and the two verifier ids each hardcoded the
repository name, in three source files plus a copy in the test fixture.
A project derived from this template had to edit all four, and all four
then became permanent conflict points for every merge back from here.

They now read the `name` this repository already declares in
package.json, so deriving a project is one line. The name is read once
at module load from a URL relative to the module itself, not from the
working directory, because these ids end up in signed provenance and
must not depend on where a script was invoked from. A missing or empty
name throws rather than falling back, for the same reason.

The value is hosted in scripts/lib/supply-chain.ts because all three
consumers already import it and it is already registered in
LOCAL_EVIDENCE_VERIFIER_SOURCE_PATHS. A new module would have needed to
join that list, which is itself part of the evidence surface.

This repository's own name is unchanged, so every emitted id is
byte-identical to before.

Also registers the three adapter files that 5cc4146 added without
updating the inventory ledger, which had left check:adapter-inventory
failing on develop.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

scripts/lib/supply-chain.ts

@@ -1,6 +1,27 @@
 import { createHash } from "node:crypto";
+import { readFileSync } from "node:fs";
 import { readFile } from "node:fs/promises";
 
+function readProjectName(): string {
+  const manifest: unknown = JSON.parse(
+    readFileSync(new URL("../../package.json", import.meta.url), "utf8"),
+  );
+  const name =
+    typeof manifest === "object" && manifest !== null
+      ? (manifest as { name?: unknown }).name
+      : undefined;
+  if (typeof name !== "string" || name.length === 0) {
+    throw new TypeError("package.json must declare a non-empty \"name\"");
+  }
+  return name;
+}
+
+/**
+ * Identity every release artifact is attributed to. A project derived from this
+ * template renames itself by editing `name` in package.json and nothing else.
+ */
+export const PROJECT_NAME = readProjectName();
+
 export type DependencyScope = "production" | "development";
 export type LockfilePackage = Readonly<{
   name: string;