`continue_` cleared the stop reason, reset the turn budget and remembered
the caller's `dir` before the session lookup ran, and nothing restored
them when the lookup refused. With the strict lookup a refusal is an
expected outcome (the caller omitted `dir`), so every such retry erased
why the session stopped from `status`, gave a capped goal session its
budget back, and made the wrong `dir` the remembered one for the next
bare `continue`.
The lookup now runs first, against the dir peeked rather than committed;
only a session that is found gets `State::begin_continue`, which does
all three. Same for the ACP path's recorded-session check.
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