diff --git a/tools/site_audit/audit.mjs b/tools/site_audit/audit.mjs
index 0b17cd5..de0622c 100644
--- a/tools/site_audit/audit.mjs
+++ b/tools/site_audit/audit.mjs
@@ -119,7 +119,44 @@ async function verifyPosts(site) {
 async function loadSite(path) {
   if (!path) return BACKYARD_01;
   const j = JSON.parse(await readFile(path, 'utf8'));
-  // site-as-data shape (Lane A, gate 2). Tolerant: only anchors + bed are needed.
+
+  // A's committed site schema (SPRINT10, world.js loadSite/createWorld) is
+  // DRESS-SOURCE, not resolved positions, and headless node cannot turn one into
+  // the other. Two reasons, both load-bearing for an audit that must not lie:
+  //
+  //   · POSTS are pre-rake. The JSON carries {id,x,z,h}; world.js:361 leans every
+  //     post 8° away from the yard centre before it becomes an anchor. p4's JSON
+  //     spec (-3.2,-1.2) dresses to (-3.72,-1.40) — 0.56 m, the exact error this
+  //     tool's own snapshot shipped with in SPRINT9. Reading x/z raw re-makes it.
+  //   · HOUSE and TREE anchors have NO coordinates at all — just `node`, a name
+  //     baked into E's GLB (fascia_anchor_01, branch_anchor_02…). Their world
+  //     position exists only after dress() reads the empty's matrixWorld, and
+  //     dress() needs GLTFLoader + fetch, neither of which runs in node.
+  //
+  // So a headless read of this file gets posts wrong and tree/house anchors not
+  // at all — and the branch anchors are exactly where the dangerous quads live
+  // (t2b pulled 10 kN in SPRINT9). Reporting on that silently is the SPRINT6
+  // trap in reverse: a site called unriggable because the TOOL couldn't read it.
+  //
+  // The correct source of dressed positions is createWorld(site).anchors — which
+  // is browser-only. Until that path lands (this is raised to A in THREADS), the
+  // honest move is to refuse this schema loudly, not to guess at it.
+  const dressSource = Array.isArray(j.posts) || j.house || Array.isArray(j.trees) || Array.isArray(j.structures);
+  const resolved = Array.isArray(j.anchors) && j.anchors.length
+    && j.anchors.every((a) => Number.isFinite(a.pos?.x ?? a.x));
+  if (dressSource && !resolved) {
+    throw new Error(
+      `"${j.name || j.id || path}" is a DRESS-SOURCE site (posts/house/trees), and its anchor\n` +
+      `  positions cannot be resolved headless: posts are pre-rake (world.js leans them 8°) and\n` +
+      `  house/tree anchors are GLB node refs that only exist after dress(), which node cannot run.\n` +
+      `  Audit it in the browser off createWorld(site).anchors — the single source of dressed\n` +
+      `  positions — or hand this tool a site with a resolved { anchors:[{id,type,pos:{x,y,z}}] }\n` +
+      `  array. Run with no argument to audit the built-in DRESSED backyard_01 snapshot.\n` +
+      `  (This limitation and the browser-audit plan are in THREADS for Lane A.)`);
+  }
+
+  // Resolved-positions shape: a flat anchors[] each carrying real coordinates.
+  // This is what a dressed export (or a future createWorld dump) would hand us.
   const anchors = (j.anchors || []).map((a) => ({
     id: a.id, type: a.type || 'post',
     pos: { x: a.pos?.x ?? a.x, y: a.pos?.y ?? a.y, z: a.pos?.z ?? a.z },