fix(pm): write the near-miss dedupe separator as its escape text, not the byte

An editing tool materialised the escape into a real 0x01 while the key was
written — the slip `check-nul-bytes` exists for. Byte-identical at runtime.

Claude-Session: https://claude.ai/code/session_01Gqi43smmqjJ5sUrhfoPeKu
Co-authored-by: Claude <noreply@anthropic.com>

Author: claude

scripts/pm/check-half-states.mjs

@@ -1382,7 +1382,7 @@ export function ownershipMarkerNearMisses(commentRows) {
         if (!hit) continue;
         if (line.slice(hit[0].length).trim() === '') break;
         const prefix = hit[0].trim();
-        const key = `${form.id}
${prefix}`;
+        const key = `${form.id}\u0001${prefix}`;
         if (!seen.has(key)) {
           seen.add(key);
           out.push({