chore: rename to @soulcraftlabs/brainy for Open Brainy on The Source

Prepares the repo for its new home at soulcraftlabs/open-brainy ahead
of the Forgejo transfer: package name, publish registry, release
script, and every install/import reference across docs, src, tests,
examples, and integrations now point at @soulcraftlabs/brainy on
The Source. The npmjs storefront leg and byte-identity pair
verification are stripped from the release script — The Source is
now the only publish target. README gains an Open Brainy explainer
and a registry note for consumers.

@soulcraft/brainy 10.4.2 was the last release under the old name.

src/brainy.ts

@@ -952,14 +952,14 @@ export class Brainy<T = any> implements BrainyInterface<T> {
    * extends FileSystemStorage`) inherit new methods Brainy adds to
    * `FileSystemStorage` / `BaseStorage` automatically — `typeof` walks the
    * prototype chain, so there's no in-package version skew to worry about as
-   * long as the plugin's own dist resolves `@soulcraft/brainy` dynamically
+   * long as the plugin's own dist resolves `@soulcraftlabs/brainy` dynamically
    * (which Cortex 2.2.x onward does — see
    * `node_modules/@soulcraft/cor/dist/storage/mmapFileSystemStorage.js`).
    *
    * This helper exists for the **build/install** failure modes the import
    * resolution can't catch:
    *   - Stale `node_modules` left over from a prior `bun install` against
-   *     `@soulcraft/brainy ≤7.20.x`.
+   *     `@soulcraftlabs/brainy ≤7.20.x`.
    *   - Lockfile drift pinning brainy below the version that introduced the
    *     method.
    *   - Docker layer caches that reuse a `node_modules` from an earlier image.
@@ -1175,7 +1175,7 @@ export class Brainy<T = any> implements BrainyInterface<T> {
               `and the flush-request RPC are disabled for this directory. ` +
               `Likely fix: clean install (\`rm -rf node_modules bun.lockb && ` +
               `bun install\`) or rebuild your container image to refresh ` +
-              `\`@soulcraft/brainy\` to ≥7.21. See docs/concepts/storage-adapters.md.`
+              `\`@soulcraftlabs/brainy\` to ≥7.21. See docs/concepts/storage-adapters.md.`
             )
           } else {
             console.warn(