- **System message customize mode** — new `:customize` mode for `:system-message` enables section-level overrides of the Copilot system prompt. Ten configurable sections: `:identity`, `:tone`, `:tool-efficiency`, `:environment-context`, `:code-change-rules`, `:guidelines`, `:safety`, `:tool-instructions`, `:custom-instructions`, `:last-instructions`. Each section supports static actions (`:replace`, `:remove`, `:append`, `:prepend`) and transform callbacks (1-arity functions receiving current content, returning modified text). New `system-prompt-sections` constant exported from main namespace (upstream PR #816).
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