a truncated or hand-edited honcho.json reads as {} on the tolerant read
path. the next write then replaced the file with only the current host
block: an oauth refresh, a login, or any 'hermes honcho' command that
saves a setting wiped every other host and the root keys.
_read_config_strict now raises on a parse error the same way it raises
on a read error, and logs one sentence naming the file. _rotate_and_persist
treats that as a refresh failure and enters the cooldown without spending
the refresh token. install_grant raises into the setup flow. in cli.py
every write goes through _write_config, which runs the same check first
and raises ConfigWriteRefused; the honcho router, the setup wizard and the
profile sync print the sentence instead of a traceback. the wizard checks
before asking its questions. read paths keep the {} fallback.
follows #95860, which added the strict reader for unreadable files and
kept a .corrupt copy on a parse error. leaving the original file in place
keeps the same bytes without a second copy of the tokens on disk.
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