feat: add target repo examples and file layout guidance

examples/rust-project/ai/task-templates.md

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+# Task Templates
+
+## Bugfix
+1. Read the affected module and relevant tests
+2. Confirm whether the crate is part of a workspace
+3. Implement the narrowest safe fix
+4. Run targeted checks first, then broader cargo validation
+5. Report any feature-flag or cross-crate risks
+
+## Feature
+1. Preserve existing public interfaces unless instructed otherwise
+2. Keep new dependencies to a minimum
+3. Add tests for normal and edge cases
+4. Run fmt, clippy, and tests before reporting completion