The fixture reported device capacity 100, making the 25% cap 25 — below
the learned budget of 37 — so the post-adaptation checks released again
and the test failed. Raise the fixture capacity to 400 so the cap stays
above the learned budget and the test isolates peak adaptation; verified
against the real suite on the L20X validation host (15 passed).
Signed-off-by: hsliuustc0106 <liuhongsheng4@huawei.com>