Adds a mandatory Hunk Verification Table output to Step 4 (columns: file,
hunk_id, signature_line, line_count, verified) and a new Step 5 gate that
STOPs with an actionable error if any row shows verified: no or the table
is absent. Prevents the LLM from silently bypassing post-merge checks by
making the next step structurally dependent on the table's presence and
content. Adds four regression tests covering table presence, column
requirements, Step 5 reference, and the gate condition.
Fixes#1999
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
fc4fcab676