feat: add Phaser 4 rule pack

[agjs]

Summary

Adds a phaser rule pack (analogous to the three.js pack) that auto-applies when phaser is in package.json.

Ten AST rules for Phaser 4 as a render substrate:

Rule	Default	What it catches
no-phaser-import-in-pure-layers	error	import "phaser" from domain/content/shared/features
require-scene-shutdown-hook	error	Scene binds .on() without SHUTDOWN/DESTROY
no-unmanaged-global-listeners	error	window/document/Game/Registry/Scale/anims/textures listeners inside a Scene
no-phaser-alloc-in-update	warn	this.add.* / new Phaser.Math.* / setText in update/tick
no-physics-collider-in-update	error	physics.add.overlap/collider in the tick
no-raw-scene-key-literal	error	scene.start("World") / super("Boot")
no-raw-texture-key-literal	warn	string-literal texture/audio keys
no-ignore-destroy	error	ignoreDestroy = true
no-loader-in-update	error	this.load.* in the tick
no-global-phaser	warn	script-tag Phaser / require("phaser")

Not in this PR: IStackAdapter, scaffold archetype, ManagedScene/ECS, typed asset manifest.

Test plan

• bun test packages/core/tests/rule-pack-phaser.test.ts (registry, each rule, phaser-starter fixture lints clean)
• bun test packages/core/tests/rule-docs-examples.test.ts (every pack doc example trips/satisfies)
• bun test packages/core/tests/stack-detection.test.ts (phaser: 4.2.1 detects the pack)
• bun run ci:local (rules/arch check, typecheck, lint, format, 5755 tests, PTY e2e)

[agjs]

Template confinement: boringstack-xyz/Phaser-TypeScript-AI-First-Starter#37