fix(navigation): block desk_cubicle in nav grid with zero padding to prevent walk-through (#75)

- desk_cubicle now has blocksNavigation: true with navPadding: 0
  (tight blocking, no inflation — aisles stay clear)
- buildNavGrid reads per-item navPadding from ITEM_METADATA
- getDeskLocations targets y-5 (chair position, above desk blocked zone)
- Agents route AROUND desks instead of through them
- Chair stays passable so agents can reach their sitting position

Fixes object passthrough for desks. Other large passable items
(doors, lamps) unchanged — they remain non-blocking by design.

Co-authored-by: Neo (subagent) <neo@openclaw.local>
Co-authored-by: Luke The Dev <252071647+iamlukethedev@users.noreply.github.com>

src/features/retro-office/RetroOffice3D.tsx

@@ -4500,7 +4500,7 @@ export function RetroOffice3D({
       const agent = renderAgentLookupRef.current.get(agentId);
       if (!agent) return;
       const tx = item.x + 40;
-      const ty = item.y + 40;
+      const ty = item.y - 5;
       const path = planPath(agent.x, agent.y, tx, ty);
       // Mutate the render agent ref directly so the tick loop picks it up.
       Object.assign(agent, {

src/features/retro-office/core/geometry.ts

@@ -107,7 +107,7 @@ export const getItemBaseSize = (item: FurnitureItem) => {
  * This is the single source of truth for nav-blocking behaviour. `buildNavGrid` in
  * navigation.ts reads this instead of maintaining its own hardcoded type set.
  */
-export const ITEM_METADATA: Record<string, { blocksNavigation: boolean }> = {
+export const ITEM_METADATA: Record<string, { blocksNavigation: boolean; navPadding?: number }> = {
   // ── structural ────────────────────────────────────────────────────────────
   wall:            { blocksNavigation: true  },
   door:            { blocksNavigation: false }, // passable
@@ -117,7 +117,7 @@ export const ITEM_METADATA: Record<string, { blocksNavigation: boolean }> = {
   couch_v:         { blocksNavigation: true  },
   beanbag:         { blocksNavigation: true  }, // large floor seat (issue #4)
   // ── desks / workstations ──────────────────────────────────────────────────
-  desk_cubicle:    { blocksNavigation: false }, // agents stand at these; collision handled separately
+  desk_cubicle:    { blocksNavigation: true, navPadding: 0 }, // blocks nav with zero padding (tight to desk body)
   executive_desk:  { blocksNavigation: true  },
   // ── tables ────────────────────────────────────────────────────────────────
   round_table:     { blocksNavigation: true  },

src/features/retro-office/core/navigation.ts

@@ -84,14 +84,15 @@ const itemBlocksNavigation = (type: string): boolean =>
 
 export function buildNavGrid(furniture: FurnitureItem[]): NavGrid {
   const grid = new Uint8Array(GRID_COLS * GRID_ROWS);
-  const pad = GRID_CELL * 0.6;
+  const defaultPad = GRID_CELL * 0.6;
   for (const item of furniture) {
     if (!itemBlocksNavigation(item.type)) continue;
+    const itemPad = ITEM_METADATA[item.type]?.navPadding ?? defaultPad;
     const bounds = getItemBounds(item);
-    const x1 = bounds.x - pad;
-    const y1 = bounds.y - pad;
-    const x2 = bounds.x + bounds.w + pad;
-    const y2 = bounds.y + bounds.h + pad;
+    const x1 = bounds.x - itemPad;
+    const y1 = bounds.y - itemPad;
+    const x2 = bounds.x + bounds.w + itemPad;
+    const y2 = bounds.y + bounds.h + itemPad;
     const c1 = Math.max(0, Math.floor(x1 / GRID_CELL));
     const c2 = Math.min(GRID_COLS - 1, Math.floor(x2 / GRID_CELL));
     const r1 = Math.max(0, Math.floor(y1 / GRID_CELL));
@@ -302,7 +303,7 @@ export function astar(
 export const getDeskLocations = (items: FurnitureItem[]) =>
   items
     .filter((item) => item.type === "desk_cubicle")
-    .map((item) => ({ x: item.x + 40, y: item.y + 40 }));
+    .map((item) => ({ x: item.x + 40, y: item.y - 5 }));
 
 export const getMeetingSeatLocations = (items: FurnitureItem[]) => {
   // Meeting seats are inferred from chair placement in the conference area so standup
@@ -497,7 +498,7 @@ export const resolveDeskIndexForItem = (
   if (deskLocations.length === 0) return -1;
   if (item.type === "desk_cubicle") {
     return deskLocations.findIndex(
-      (desk) => desk.x === item.x + 40 && desk.y === item.y + 40,
+      (desk) => desk.x === item.x + 40 && desk.y === item.y - 5,
     );
   }
 

tests/unit/navigation.navBlockers.test.ts

@@ -203,17 +203,19 @@ describe("buildNavGrid + astar – full pathfinding integration (issue #4)", ()
 });
 
 describe("buildNavGrid – specific non-blocking item types (issue #4)", () => {
-  it("desk_cubicle does NOT block navigation — agents stand at these", () => {
+  it("desk_cubicle blocks navigation with zero padding — agents route around desks", () => {
     /*
-     * desk_cubicle has blocksNavigation: false in ITEM_METADATA.
-     * Agents interact with desks by standing beside them; the desk itself
-     * is not a solid blocker in the pathfinding grid.
+     * desk_cubicle has blocksNavigation: true with navPadding: 0 in ITEM_METADATA.
+     * The desk body is blocked in the nav grid so agents route around it,
+     * but zero padding keeps aisles between desks navigable.
+     * Agents sit at the chair position (y - 5), which is above the blocked zone.
      */
     const item = makeItem("desk_cubicle", 400, 300);
     const grid = buildNavGrid([item]);
-    expect(isBlocked(grid, 400, 300)).toBe(false);
+    expect(isBlocked(grid, 400, 300)).toBe(true);
     // Confirm via metadata as the authoritative source.
-    expect(ITEM_METADATA["desk_cubicle"]?.blocksNavigation).toBe(false);
+    expect(ITEM_METADATA["desk_cubicle"]?.blocksNavigation).toBe(true);
+    expect(ITEM_METADATA["desk_cubicle"]?.navPadding).toBe(0);
   });
 
   it("door does NOT block navigation — agents must be able to walk through doors", () => {