Resolve two consistency nits from review: shape-spec said plan-review was
'optional' for Small while the README canonical table says skip it (align
to skip); and the changelog now describes both misuse directions the new
rationalizations guard against, not just gate-skipping.
Add one rationalization row to each design-phase skill against using the
tier model as an excuse to skip the evidence gate (verification-gate /
code-review-loop never scale by tier), and record the change in the
changelog.