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DeepSeek-Reasonix/scripts
esengine d84bc0c625 ci(release-studio): sign Windows with a Studio-owned Certum certificate
SignPath has no quota left, so Studio Windows builds could only ship
unsigned. Port the 1.x Certum SimplySign signer, pointed at Studio's own
account and certificate.

- Signing runs only when STUDIO_SIGNING_ENABLED=true, as three jobs, so
  the SimplySign session is never up while third-party code runs:
  windows-sign-payload signs the window, kernel and computer-use helper;
  windows-package builds the installer and zip on a separate runner with
  no environment or secrets; windows-sign-installer signs the installer.
  The two signing jobs check out only workflow_sha, install no
  toolchain, leave Defender on, and stop SimplySign after signing.
- Verification checks trust, the pinned thumbprint, the
  STUDIO_SIGNING_SUBJECT subject, an issuer and a timestamp on every
  signed executable, on the installer, and on the zip's copies.
- The SimplySign MSI is pinned by SHA-256 as well as by its signature.
- With the switch on, a missing secret or subject, or any signing
  failure, blocks publish. The release body's Windows sentence follows
  windows-sign-installer's result.
- Credentials are STUDIO_CERTUM_USERNAME, STUDIO_CERTUM_OTP_URI and
  STUDIO_CERTUM_KEY_ID only. The concurrency group is
  studio-certum-signing, shared with a new non-publishing smoke workflow.
- publish downloads every package artifact by its exact name, taking
  Windows from windows-sign-installer when it ran, and fails when two
  artifacts carry the same file name.
- signing-contract validates and fingerprints both the tag's tree and the
  workflow_sha tree.
- The SignPath request steps, artifact configurations and request helper
  are removed. The contract now covers the Certum files, and its call
  graph detects Certum credentials.
- The runbook lists the repository settings to decide on before enabling
  and says which PE files stay unsigned (Electron DLLs, elevate.exe, the
  NSIS uninstaller).
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