Rust

Enhance PreambleBuilder with system_prompt, add_context, and allowed_paths support #55

Job	Run time
build-and-test (ubuntu-latest, x86_64-unknown-linux-gnu, false)	1m 54s
build-and-test (macos-latest, aarch64-apple-darwin, false)	2m 11s
build-and-test (windows-latest, x86_64-pc-windows-msvc, false)	2m 9s
publish-crate	0s
	6m 14s

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