Corrode 13.08: keep paths on the floor at defender spawn; fix the spawn corner

- Navigation: the 13.08 navmesh is still walkable east of the wall the
  13.08 minimap, vision lines and art put at x 237.5 beside defender
  spawn, so a page transition could walk an agent through it. The bundled
  navigation cuts that strip out (grown by the agent radius) and rebuilds
  the four polygons and their portals it touched.
- Cones: west of attacker spawn, 13.06's vision lines put the outer
  wall's corner 8.5 units south of the drawn one and blocked cones across
  open floor. Use 13.08's lines, which match the art, at that corner.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
e128595f88Dara Adedeji committed on 10/14/2026, 4:12:29 AMparent81323d2

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