Shared travelers resource assertion

- generic:
  - generic:
    - generic "Darkwind 3D world. Use WASD to walk, mouse or arrow keys to look, and E to interact." [active] [ref=e1]
    - generic "Nearby travelers"
    - banner:
      - generic [ref=e2]:
        - img [ref=e3]
        - generic [ref=e6]:
          - generic [ref=e7]: DARKWIND
          - generic [ref=e8]: A WORLD WORTH WANDERING
      - generic [ref=e9]:
        - generic [ref=e12]: Your journey is saved
        - button "Enable ambience" [ref=e13] [cursor=pointer]:
          - img [ref=e14]
        - button "Open menu" [ref=e17] [cursor=pointer]:
          - img [ref=e18]
    - generic:
      - generic: The Old Sanctuary
      - generic: "N"
    - generic:
      - generic:
        - generic: A light in the wilds
        - paragraph: The light remembers
        - generic: A small kindness, carried into the world.
      - button "E Tend the beacon" [ref=e20] [cursor=pointer]:
        - generic [ref=e21]: E
        - generic [ref=e22]: Tend the beacon
      - generic:
        - generic:
          - generic:
            - generic: W A S D
            - text: Walk
          - generic:
            - generic: ↔
            - text: Look
          - generic:
            - generic: Space
            - text: Jump
          - generic:
            - generic: Shift
            - text: Run
        - generic [ref=e23]:
          - button "Chat ↵" [ref=e24] [cursor=pointer]:
            - text: Chat
            - generic [ref=e25]: ↵
          - button "Journal J" [ref=e26] [cursor=pointer]:
            - img [ref=e27]
            - text: Journal
            - generic [ref=e29]: J
          - button "Satchel I" [ref=e30] [cursor=pointer]:
            - img [ref=e31]
            - text: Satchel
            - generic [ref=e34]: I
    - complementary [ref=e35]:
      - heading "ENGINE OBSERVATORY" [level=3] [ref=e36]
      - generic [ref=e37]:
        - term [ref=e38]: Engine
        - definition [ref=e39]: 0.1.0
        - term [ref=e40]: Renderer
        - definition [ref=e41]: Owned WebGPU
        - term [ref=e42]: Presentation
        - definition [ref=e43]: Canonical ECS
        - term [ref=e44]: Canonical entities
        - definition [ref=e45]: "1481"
        - term [ref=e46]: Rigged travelers
        - definition [ref=e47]: "0"
        - term [ref=e48]: Walking travelers
        - definition [ref=e49]: "0"
        - term [ref=e50]: Stalled travelers
        - definition [ref=e51]: "0"
        - term [ref=e52]: Motion samples
        - definition [ref=e53]: "0"
        - term [ref=e54]: Physics
        - definition [ref=e55]: Rapier 0.21.0
        - term [ref=e56]: Place
        - definition [ref=e57]: sanctuary
        - term [ref=e58]: Simulation
        - definition [ref=e59]: 0.90 ms / 30 Hz
        - term [ref=e60]: Frame interval p50
        - definition [ref=e61]: 33.4 ms
        - term [ref=e62]: Frame interval p95
        - definition [ref=e63]: 133.4 ms
        - term [ref=e64]: Render CPU
        - definition [ref=e65]: 0.80 ms
        - term [ref=e66]: Instances
        - definition [ref=e67]: "225"
        - term [ref=e68]: Visible / shadow instances
        - definition [ref=e69]: 35 / 225
        - term [ref=e70]: Triangles
        - definition [ref=e71]: 4,632
        - term [ref=e72]: Draw calls
        - definition [ref=e73]: "8"
        - term [ref=e74]: GPU buffers / textures
        - definition [ref=e75]: 49 / 4
        - term [ref=e76]: Target texels (estimate)
        - definition [ref=e77]: 23.0 MiB
        - term [ref=e78]: Render passes
        - definition [ref=e79]: shadow → scene → post
        - term [ref=e80]: Shader revision
        - definition [ref=e81]: "1"
        - term [ref=e82]: Graphics recoveries
        - definition [ref=e83]: "0"
        - term [ref=e84]: Render size
        - definition [ref=e85]: 960 × 640
        - term [ref=e86]: Position
        - definition [ref=e87]: 0.00, 0.78, -1.79
        - term [ref=e88]: Room
        - definition [ref=e89]: Solo diagnostic
        - term [ref=e90]: Players
        - definition [ref=e91]: "1"
        - term [ref=e92]: Authority epoch
        - definition [ref=e93]: —
        - term [ref=e94]: Room revision
        - definition [ref=e95]: —
        - term [ref=e96]: Role
        - definition [ref=e97]: Room host
        - term [ref=e98]: Persistence
        - definition [ref=e99]: Local device
      - button "Export playtest report" [ref=e100] [cursor=pointer]:
        - text: Export playtest report
        - img [ref=e101]
      - paragraph [ref=e103]:
        - text: F2 to close · CPU timings, not GPU time.
        - text: Browser-owned cooperative room. Trusted playtesters only.