refactor: rename llm worker crate to engine

crates/llm-engine-macros/README.md

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+# llm-engine-macros
+
+## Role
+
+`llm-engine-macros` provides procedural macros for declaring Rust methods as LLM-callable tools.
+
+## Boundaries
+
+Owns:
+
+- compile-time generation of tool argument structures and definitions
+- small macro conveniences around tool descriptions and schemas
+
+Does not own:
+
+- runtime permission decisions
+- filesystem scope checks
+- tool execution policy
+- model/tool-loop orchestration
+
+## Design notes
+
+Macros reduce boilerplate, but they must not imply capability. A generated tool definition is still subject to manifest permissions, Pod scope, and runtime policy.
+
+## See also
+
+- [`../../docs/design/tool-permissions-scope.md`](../../docs/design/tool-permissions-scope.md)