tests: wait for the thing, don't sleep and hope

test_trace_ui spent 18.8 of its 35.2 seconds in flat pilot.pause() calls placed
to let an async seek land. Two loops were most of it: 6 iterations at 0.5s and
28 at 0.3s, 11.4s of sleeping to check that a step moves the cursor.

They are condition waits now. The questions are unchanged -- does the listing
cursor reach the pc, does the pseudocode cursor follow -- but they cost what
they cost instead of a fixed budget. The second loop settles on something that
does NOT presuppose the answer (the listing cursor arriving, and the trail map
belonging to the loaded function): waiting on 'is this pc mapped' would have
burned the timeout on every unmapped instruction, about half of them, and come
out slower than the sleep it replaced.

35.2s -> 20.9s, 39 checks, stable over repeated runs.

tests/_fixtures.py collects the staging both this suite and test_scenarios need
-- scratch copy, seeded from a golden .i64 nothing writes back to -- which was
private to test_scenarios. Worth saying plainly: on targets/echo the seeding is
worth 0.19s, not the analysis time I assumed when I went looking. It is shared
for the deduplication and for whatever gets pointed at a bigger binary.

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