Polish OpenAI migration reference for readability

[jonathanhefner]

Add framing prose to the migration guide to improve navigation:

• Expanded intro describing document purpose and how to use it
• Added note about features marked "Not yet implemented"
• Added brief transition sentences before Server-Side and Client-Side sections

[pkg-pr-new]

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@modelcontextprotocol/ext-apps

npm i https://pkg.pr.new/modelcontextprotocol/ext-apps/@modelcontextprotocol/ext-apps@345

@modelcontextprotocol/server-basic-react

npm i https://pkg.pr.new/modelcontextprotocol/ext-apps/@modelcontextprotocol/server-basic-react@345

@modelcontextprotocol/server-basic-vanillajs

npm i https://pkg.pr.new/modelcontextprotocol/ext-apps/@modelcontextprotocol/server-basic-vanillajs@345

@modelcontextprotocol/server-budget-allocator

npm i https://pkg.pr.new/modelcontextprotocol/ext-apps/@modelcontextprotocol/server-budget-allocator@345

@modelcontextprotocol/server-cohort-heatmap

npm i https://pkg.pr.new/modelcontextprotocol/ext-apps/@modelcontextprotocol/server-cohort-heatmap@345

@modelcontextprotocol/server-customer-segmentation

npm i https://pkg.pr.new/modelcontextprotocol/ext-apps/@modelcontextprotocol/server-customer-segmentation@345

@modelcontextprotocol/server-map

npm i https://pkg.pr.new/modelcontextprotocol/ext-apps/@modelcontextprotocol/server-map@345

@modelcontextprotocol/server-pdf

npm i https://pkg.pr.new/modelcontextprotocol/ext-apps/@modelcontextprotocol/server-pdf@345

@modelcontextprotocol/server-scenario-modeler

npm i https://pkg.pr.new/modelcontextprotocol/ext-apps/@modelcontextprotocol/server-scenario-modeler@345

@modelcontextprotocol/server-shadertoy

npm i https://pkg.pr.new/modelcontextprotocol/ext-apps/@modelcontextprotocol/server-shadertoy@345

@modelcontextprotocol/server-sheet-music

npm i https://pkg.pr.new/modelcontextprotocol/ext-apps/@modelcontextprotocol/server-sheet-music@345

@modelcontextprotocol/server-system-monitor

npm i https://pkg.pr.new/modelcontextprotocol/ext-apps/@modelcontextprotocol/server-system-monitor@345

@modelcontextprotocol/server-threejs

npm i https://pkg.pr.new/modelcontextprotocol/ext-apps/@modelcontextprotocol/server-threejs@345

@modelcontextprotocol/server-transcript

npm i https://pkg.pr.new/modelcontextprotocol/ext-apps/@modelcontextprotocol/server-transcript@345

@modelcontextprotocol/server-video-resource

npm i https://pkg.pr.new/modelcontextprotocol/ext-apps/@modelcontextprotocol/server-video-resource@345

@modelcontextprotocol/server-wiki-explorer

npm i https://pkg.pr.new/modelcontextprotocol/ext-apps/@modelcontextprotocol/server-wiki-explorer@345

commit: 00aecd1