feat(review): restore the canonical task for every worker; keep it runtime-only

Product decision revisited with the A/B evidence in hand: the built-in review brief was #1312's deliberate design, and the un-briefed variant ran ~35% faster but missed a real finding in the measured comparison. Depth wins — every worker (skill-bearing included) again receives the canonical profile task, restoring #1312's reviewer behavior exactly.

What stays from the earlier change: the built-in text remains a RUNTIME default — guided setup, first-run, and configure no longer persist it into saved profiles (that part was a defect: baked text masquerading as user config, freezing profiles on old wording and making the default uneditable). Users who want a lighter pass set their own shorter task.