Review follow-up on #97052 (helix4u): a fork with no upstream remote whose HEAD matches origin/main used to print plain "Already up to date!" under --yes even though official main was never consulted, so an unattended stale fork looked current. _sync_with_upstream_if_needed now returns whether the official upstream was actually checked, and the commit_count == 0 completion line says "Up to date with your fork (official repo not checked)." when it was not. Skip-as-decline semantics are unchanged: no prompt, no remote mutation, no decline marker. Caller-level regression test added for the fork + no-upstream + --yes + HEAD==origin/main path; helper tests now pin the return contract.
_sync_with_upstream_if_needed called bare input() with no assume_yes parameter and no tty check, so a fork checkout without an upstream remote wedged hermes update forever in any non-interactive context (CI, cron, the desktop updater hand-off): stdin stays open, EOFError never fires. Thread assume_yes and the gateway input_fn into the helper and skip the prompt as a decline under assume_yes or a non-tty stdio pair, without writing the decline marker or touching git remotes, so interactive runs still get asked later. Both call sites forward the interaction state; the config-migration and stash-restore prompts already carry this gate.
Closes#60240 (prompt half). Supersedes #78678, #92448, #92410.
Co-authored-by: BlackishGreen33 <BlackishGreen33@users.noreply.github.com>
Co-authored-by: salch-cred <salch-cred@users.noreply.github.com>
Co-authored-by: jackulau <jackulau@users.noreply.github.com>
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