While the plugin was missing and the catalog or GitHub unreachable, every `hermes chat` process
paid a live-catalog fetch (+5.9 s on a blackholed network) and printed the raw multi-line git
stderr of the failed clone.
A failed automatic install (catalog miss, failed install) touches
<home>/cache/left-core-<plugin>.failed; agent and gateway start skip the row, before any network,
while that stamp is under an hour old. `hermes update` ignores the stamp and always retries. The
failure notice is one line: git's own fatal:/error: line when the error carries raw git output,
else its first line.
The catalog module already serves a fresh cache (6 h) and falls back to its stale/in-tree copy on
failure; pre-resolving offline would not save the round trip, because the install resolves the
entry through the live catalog again, so the gate sits before both.
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