World: collision-fidelity pass — fit walls/cover/landmarks to visuals + solid sweep

Phase 1.5 stabilize #2 (gate-approved incl. missing-collider adds + the
07-09 height/solid-sweep directive). New ColliderFitTools (Editor,
audit/apply, idempotent) refits the subscene Environment colliders to
the Game.unity render meshes:

- Boundary rings rebuilt 16/24/24 -> 54/82/82 segments (~3.5-4 u arcs)
  around the DESIGN radii (30/52 - fitting from the current segments
  ratchets inward on re-runs), inner faces fitted to ankle-band
  (0.45-2.5) cliff vertices so the wall stops the player before any
  visibly rising skirt.
- 8 room cover boxes -> convex MeshColliders of the actual CoverRock_*
  meshes (needed Read/Write on 2 PNB rock meshes: a MeshCollider bakes
  ONLY if the mesh is readable - InvalidOperationException per bake,
  classic scene view still shows the collider).
- 11 landmarks: hint-matched claim-once OBB fits (cabin/tent walk-into
  fixed; well/sign/artefact invisible walls removed).
- 85 adds: generic solid sweep (>=0.5 u tall, non-flora, walk-band
  geometry, gated by the LOCAL fitted wall radius) - cacti, succulents,
  boulders, bone piles, small rocks, craters (full set-piece blocks),
  crates, tree trunk, turbine poles, dish, solar rigs. Collider tops
  pinned to the visual top (cap 3): nothing solid-looking is
  walk-through or walk-over. Elevated-only geometry (rotors, panels)
  excluded - no phantom ground walls.

Verified: baked-CollisionWorld probes (ring closure 32/32/region, 10/10
solidity samples across base + both room slots, open ground free,
server==client parity at 323 static bodies), enemy backstop live smoke
(enemy embedded in the new crater block depenetrated out and re-engaged
across ~12 u; 4 others converged normally through ~40 obstacles),
466/466 EditMode, console clean.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

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