Adds a one-shot `hermes desktop --setup-tcc-identity` command that creates a
self-signed code-signing certificate in the login keychain (openssl +
security import), grants codesign access to it, writes
desktop.macos_signing_identity to config.yaml, and re-signs the packaged app
with a certificate-anchored Designated Requirement.
macOS persists permission grants (Full Disk Access, Accessibility, Files and
Folders, microphone) against the app's code-signing identity, not its path.
The default identifier-pinned ad-hoc signature is stable across rebuilds, but
a certificate-anchored identity is the strongest guarantee — the same
mechanism yabai/skhd rely on. Previously users had to create the certificate
manually in Keychain Access; this command automates the whole flow and is
idempotent (re-run after updates).
Docs: desktop.md TCC section now leads with the command, keeps manual steps.
Tests: 4 new — fresh cert creation path, idempotent reuse, non-macOS no-op,
cmd_gui early-exit before build.
eeb391d0b1