feat(workflow): sample review_report schema + implementer↔reviewer loop

examples/workflows/review_loop.toml

@@ -0,0 +1,58 @@
+# Implementer ↔ reviewer refinement loop.
+#
+# The reviewer emits a validated `review_report` artifact carrying a `verdict` field.
+# The loop exits to `done` when verdict == "approved" and loops back to `implement`
+# otherwise (verdict != "approved"). The runtime refinement guard caps the
+# review→implement cycle at `implement.max_retries` iterations and then escalates.
+#
+# Requires a `review_report` artifact kind declared in config:
+#   [[artifacts]]
+#   id = "review_report"
+#   schema_path = "schemas/review_report.json"
+#   llm_emitted = true
+
+id = "review_loop"
+start = "implement"
+
+[[stages]]
+id = "implement"
+prompt = "prompts/implement.md"
+produces = [{ name = "patch", kind = "file_written" }]
+allowed_tools = ["file_write"]
+token_budget = 8192
+max_retries = 3
+
+[[stages]]
+id = "review"
+prompt = "prompts/review.md"
+needs = ["patch"]
+produces = [{ name = "review_report", kind = "review_report" }]
+token_budget = 8192
+max_retries = 3
+
+[[transitions]]
+id = "implement-to-review"
+from = "implement"
+to = "review"
+condition_type = "artifact_validated"
+condition_artifact_id = "patch"
+
+[[transitions]]
+id = "review-approved"
+from = "review"
+to = "done"
+condition_type = "artifact_field_equals"
+condition_artifact_id = "review_report"
+condition_field = "verdict"
+condition_value = "approved"
+condition_operator = "eq"
+
+[[transitions]]
+id = "review-changes-requested"
+from = "review"
+to = "implement"
+condition_type = "artifact_field_equals"
+condition_artifact_id = "review_report"
+condition_field = "verdict"
+condition_value = "approved"
+condition_operator = "neq"