Resolves the four conditions on the approved-feature verdict for #3646:
new execute:task granularity tier below wave, hard-halt enforced via a
code-side resolver seam (Lens B) rather than prose dispatch (since #3647's
dispatch-reliability defect is still open), registration/validation
requirements for loop-hook-dispatch.md + capability-validator.cjs, and
autonomous-mode behavior via a new non-gate kind.
Closes#3969
Co-authored-by: sim <sim@local>
