docs(task-review): sharpen the :solo: tag definition

Craig clarified what :solo: means. The old third gate ("the outcome is verifiable locally, no ... confirmation that the result is right") read literally disqualified every task, since Craig spot-checks everything regardless of the tag. It conflated "Craig will also check" with "only Craig can check."

The three gates are now buildable, verifiable by Claude, and no upfront decision. The fix is decoupling Craig's routine spot-check from the determination: a task Claude builds and verifies itself, leaving a manual-testing reminder for the residual human-in-the-loop confirmation, is solo. The disqualifier is having no verification path of Claude's own, a result only judgeable by Craig's eyes. task-audit.org Phase C already defers here for the definition, so this is the one edit site.

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