chore(main): release 4.5.0

[github-actions]

🤖 I have created a release beep boop

4.5.0 (2025-08-14)

⚠ BREAKING CHANGES

• prompts: callback receives the full response object instead of just content.

Features

• prompts: add support for providing system prompt as function (#1318) (33e6ffc)

Bug Fixes

• completion: require tool uri for input completion (#1328) (76cc416)
• config: correct system_prompt type and callback usage (#1325) (f99f1cd)
• prompt: recursive system prompt expansion (#1324) (26f7b4f), closes #1323
• utils: always exit insert mode in return_to_normal_mode (#1313) (957e0a8), closes #1307

Miscellaneous Chores

• mark next release as 4.5.0 (#1315) (d12f6df)

Code Refactoring

• prompts: support template substitution in system_prompt (#1312) (081d4c2)

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