Add demo entry door and shrink player collision radius

[PJensen]

Summary

• reduce the default player bounding circle radius so 1-tile corridors are traversable
• add and reset a closed door at the demo scene hallway entrance for interaction testing

Testing

• npm test (fails: Error [ERR_MODULE_NOT_FOUND]: Cannot find module '/workspace/JSHack/src/lib/ecs-js/index.js')

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Codex Task

[Copilot]

Pull Request Overview

This PR adjusts the player's default bounding radius to enable navigation through single-tile corridors and adds a door to the demo scene for testing gameplay mechanics.

• Reduced player's default bounding circle radius from 0.55 to 0.45
• Added door placement functionality to the demo scene

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/rules/archetypes/Player.js	Updated default BoundingCircle radius to 0.45 in both the archetype definition and fallback createPlayer function, with explanatory comment
src/main/scene/demoScene.js	Added placeEntryDoor function with necessary imports to place a door in the demo room for testing

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