Add orch Markdown test-plan skeleton

docs/tests/orch/workflows/README.md

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+# Orch Workflow Test Plan
+
+## Scope
+
+This document tracks cross-command scenarios where the main value is the interaction between multiple `orch` commands, and often between `orch` and `inbox`.
+
+All examples assume:
+
+- isolated temp database
+- `orch --db TMPDIR/coord.db --json` is used consistently
+- assertions follow the shared rules in [../_shared/README.md](../_shared/README.md)
+
+## Current Status
+
+No workflow case documents are authored yet.
+
+Planned first workflow cases live in [../ROADMAP.md](../ROADMAP.md), starting with:
+
+- `run-dispatch-reconcile-status-happy-path`
+- `dependency-blocked-answer-resume-flow`
+- `strict-worktree-dispatch-to-cleanup`
+- `council-review-end-to-end`