HeadlessConsoleController.Handle called _submit(rawLine) bare: an
UnknownCommand/Dropped outcome printed nothing (the operator had no way
to tell their line did nothing), and any exception from the submit
callback would propagate out of DrainDue into the scheduler's
per-session quarantine catch, faulting the whole session over one
console typo. Wrap the submit in try/catch and report both cases with a
visible line, mirroring LoginCommandSequence.DrainDue's own reporting
for login-line failures.
N1: also corrected this class's own <remarks> doc comment, which
described the dispatch order as "plugin-verb registry -> client/server
slash commands" -- the real ChatCommandRouter.Submit order is retail's
client-command catalog, then local /help, then plugin verbs, then the
unregistered-channel-tag fallback, then an explicit server command, then
chat.
UnknownOrDroppedOutcomePrintsAVisibleLine and
SubmitFailurePrintsALineAndNeverEscapesDrainDue were shown to fail
against the prior bare `_submit(rawLine);` call: the outcome tests found
nothing printed, and the failure test caught the InvalidOperationException
escaping DrainDue itself rather than being reported as a line.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
f0b7a136b2