chore(main): release 5.0.0

[github-actions]

🤖 I have created a release beep boop

5.0.0 (2025-11-03)

⚠ BREAKING CHANGES

• chat: The prompt resolution functions have been moved to require('CopilotChat.prompts')
• get_source, and set_source methods moved to require('CopilotChat').chat
• prompt: Passing function to system_prompt is no longer supported
• functions: Removes buffers, diagnostics, register, and quickfix resources. Use buffer, selection, or clipboard instead.

Features

• prompt: support custom Copilot instructions file (b06fd11)
• provider: Support OpenAI Responses API (#1463) (746a697), closes #1442

Bug Fixes

• chat: reinsert stickies before prompt processing (#1472) (94dfc01), closes #1471
• functions: insert explicit selected buffers (#1477) (2ef8c89)
• mappings: use get_messages for quickfix answers (#1466) (db4b51e), closes #1465
• mappings: use resource name if available in preview header (#1459) (5801bfe)
• utils: properly pass cwd as argument to system wrapper (#1458) (92f2699)

Code Refactoring

• chat: move prompt resolution helpers to prompts module (#1470) (cb8fb0f)
• functions: unify buffer/selection/diagnostics resources (#1456) (cf4f7a5)
• move source/sticky logic to chat window (#1469) (1ff0bb3)

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