PR #133714 ("test: pin each provider's wire, real error bodies, and the
prompt-cache prefix contract") was merged before review and discussion
finished. This reverts both of its commits so main is back to the state
before it landed:
- 74306c1d1b test: the skill scaffold prefix cell is a plain regression test now that #133715 landed
- 560e53638c test: pin the wire every provider receives, real error bodies, and the prompt-cache prefix contract
Test-only revert: removes the three test files and the wire snapshot
fixture; no production code is touched. Discussion continues on #133714.
93cbf617c7