chore(main): release 5.0.0

[github-actions]

🤖 I have created a release beep boop

5.0.0 (2026-02-02)

⚠ 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

• add .emmyrc.json for LuaJIT runtime and workspace config (#1505) (d4c9ebe)
• config: support multiple custom instruction files (#1510) (90ebb50)
• copilot: optimize copilot quota usage for tool calling (1225fe8)
• copilot: Support "Auto" model mode (Smart Model Selection) similar to VS Code (#1518) (4d5dc1c)
• prompt: support custom Copilot instructions file (b06fd11)
• provider: Support OpenAI Responses API (#1463) (746a697), closes #1442

Bug Fixes

• chat: insert stickies passed to open() (#1476) (8769d22), closes #1475
• chat: reinsert stickies before prompt processing (#1472) (94dfc01), closes #1471
• config: correct AGENTS.md filename casing (#1511) (07dcc18)
• diff: implement offset tracking for sequential hunk application (#1493) (9140021)
• 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)
• providers: Correctly handle tool calls and responses API output (#1501) (02c5cf3), closes #1499
• support file paths with spaces in block headers (#1504) (5c5e6c2)
• ui: preserve block content formatting when parsing chat messages (#1495) (b6ff587)
• 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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