feat: add target repo examples and file layout guidance

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

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+# Task Templates
+
+## Bugfix
+1. Read the affected package and nearby tests
+2. Explain root cause briefly
+3. Implement the smallest fix in the narrowest package possible
+4. Run focused validation, then `go test ./...` if appropriate
+5. Report risks, especially around concurrency and I/O
+
+## Refactor
+1. Preserve public behavior
+2. Avoid package-wide churn unless clearly justified
+3. Keep imports, naming, and package boundaries tidy
+4. Re-run tests after each meaningful step if the refactor is risky