feat(raijin): migrate runtime manifest identity

[TorinAsakura]

Task

• Close [Feature] Migrate the Raijin runtime manifest schema #893

How to verify

Main scenario

1. Context: Raijin release production for the public @atls/raijin package
   Action: Produce the runtime manifest from the verified yarn.mjs asset and root package.json
   Expected result: Schema v1 uses packageName: @atls/raijin; tagName and version identify the same public release; packageManager retains the root Yarn version; asset URL and digest semantics are unchanged

Additional scenario

1. Context: Public initializer and configured-project updater reading a runtime manifest
   Action: Provide canonical @atls/raijin and legacy @atls/yarn-cli package identities with valid runtime bytes and digest
   Expected result: Both flows parse the manifest, download and verify the runtime, and continue with the manifest's Yarn packageManager

Proofs

• runtime manifest contract

yarn test unit --test-reporter tap yarn/plugin-release/sources/tests/release-create.command.test.ts yarn/raijin/src/runtime/manifest.test.ts yarn/raijin/src/runtime/installer.test.ts yarn/raijin/src/initializer/index.test.ts yarn/plugin-essentials/sources/commands/set-version.command.test.ts
65 tests passed; 0 failed

• deterministic runtime materialization

yarn cli:build
yarn cli:build
built runtime SHA-256: 3a894488382a5a5141d3b531385b825bf93e6cffab51222eb9be52f67e573c3f
checked runtime SHA-256: 3a894488382a5a5141d3b531385b825bf93e6cffab51222eb9be52f67e573c3f

• configured release execution

yarn workspace @atls/raijin release create
checked Yarn: 4.14.1
packageName: @atls/raijin
packageManager: yarn@4.14.1
tagName: @atls/raijin@0.6.4
version: 0.6.4
manifest SHA-256 matched the exact runtime asset
GitHub release transport was replaced with a controlled local response

• repository verification

yarn raijin:check
38 commands; 44 plugins
localization passed
7 deterministic cases passed
surface PnP/ESM consumer passed
project-generation PnP/ESM consumer passed

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