fix(mcp): require visible APPROVED reviews before merge (closes #244)

Gitea expects review event APPROVED, not APPROVE; the wrong event left
submissions as PENDING drafts. Verify terminal verdicts after submit,
submit pending drafts when needed, and block merge when approval_visible
is false.

skills/llm-project-workflow/SKILL.md

@@ -237,6 +237,9 @@ Worktree folder = branch with `/` replaced by `-`
    validation completes, call `gitea_mark_final_review_decision`, then submit
    exactly one live review via
    `gitea_submit_pr_review(..., final_review_decision_ready=True)`.
+   After submitting, re-read `gitea_get_pr_review_feedback` and confirm the
+   verdict is visible (`approval_visible` true for APPROVE; PENDING drafts do
+   not count — #244). Do not merge until a visible APPROVED review exists.
    Final reports must list exactly one review mutation
    (`review_proofs.assess_review_mutation_final_report`) unless an
    operator-approved correction flow was invoked and explained.