Rewrite the user-facing persistent sandbox story around pyro workspace ..., including the install guide, first-run transcript, integrations notes, and public contract reference.
Rename the Python example to examples/python_workspace.py and update the docs to use the new workspace create, sync, exec, status, logs, and delete flows with seed_path/workspace_id terminology.
Mark the 2.4.0 workspace-contract pivot as done in the roadmap now that the shipped CLI, SDK, MCP, docs, and tests all use the workspace-first surface.
Break the updated workspace vision into a checked-in roadmap from 2.4.0 through 3.1.0 so later implementation can be driven milestone by milestone.
Link the roadmap from the vision doc and keep each release slice scoped to one product capability, from the workspace contract pivot through shells, export/diff, services, snapshots, secrets, networking, and GA promotion.
This is a docs-only planning scaffold; runtime behavior stays unchanged in this commit.
