Merge pull request #2080 from obra/fix/x7a-sdd-evidence-bearing-preflight

fix(sdd): preflight emits its checks as a ledger table and rules on what it surfaces

skills/subagent-driven-development/SKILL.md

@@ -156,16 +156,27 @@ a ledger file, not only in todos.
 Read the plan once, note its context and Global Constraints, and create a
 todo per task.
 
-Before dispatching Task 1, scan the plan once for conflicts:
+Before dispatching Task 1, scan the plan once for conflicts, writing down
+what you checked as you check it:
 
 - tasks that contradict each other or the plan's Global Constraints
 - anything the plan explicitly mandates that the review rubric treats as a
   defect (a test that asserts nothing, verbatim duplication of a logic block)
 
-Rule on everything you find before execution begins — each finding against
-the plan text that mandates it — and record each ruling in the ledger. If the
-scan is clean, proceed without comment. The review loop remains the net for
-conflicts that only emerge from implementation.
+The scan's output is a table, not a verdict. One row for every pair of tasks
+that share a file or an interface: the two tasks, what one produces against
+what the other consumes, and what you found. One row for every task: whether
+its own text agrees with itself — the tests it specifies against the code it
+specifies, the files it creates against the files it later touches. "The scan
+is clean" without those rows is not a scan you ran.
+
+Write the table to the ledger. Rule on everything you find before execution
+begins — each finding against the plan text that mandates it — and record
+each ruling in the ledger. If the scan is clean, proceed without comment.
+Rule on each conflict it surfaces — the spec is the binding authority, the
+plan is its argument — record the ruling beside its row, and dispatch
+Task 1. The review loop remains the net for conflicts that only emerge from
+implementation.
 
 ## Model Selection