`hermes import` was creating secret files with the process umask
(typically 0644) instead of 0600. zipfile.open() does not honor the
Unix mode bits stored in zip member external_attr; the restore loop
used open(target, "wb") which always falls back to umask.
Threat: silent privilege downgrade after a routine restore on
multi-user systems (shared dev boxes, CI runners, jump hosts) — any
local user could read API keys and OAuth tokens from ~/.hermes/.
Fix mirrors the convention already used at file creation
(hermes_cli/auth.py: stat.S_IRUSR | stat.S_IWUSR for auth.json).
The quick-snapshot restore path (restore_quick_snapshot) is
unaffected — it uses shutil.copy2 which preserves perms via
copystat().
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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