fix(birdhouse): block rubber cap mushroom transports on Fossil Island

[runsonmypc]

Summary

• Pathfinder routes through rubber cap mushroom shortcuts on Fossil Island, causing the walker to stall (it plans the transport but can't execute it at runtime).
• Adds tile restrictions on all 5 rubber cap mushroom origin tiles once the player arrives on Fossil Island, preventing the pathfinder from routing through them.
• Restrictions are cleared on plugin shutdown so other plugins aren't affected.
• Version bump to 1.1.3.

Not to mention this transport needs recharging, otherwise it can and will kill you.

Test plan

• Run birdhouse plugin starting from a non-Fossil-Island location
• Verify walker doesn't attempt rubber cap mushroom shortcuts between birdhouse areas
• Verify mushroom tree (mycelium) transports still work normally
• Verify restrictions are cleared after plugin stops