Implement the 2.8.0 workspace milestone with named snapshots and full-sandbox reset across the CLI, Python SDK, and MCP server.
Persist the immutable baseline plus named snapshot archives under each workspace, add workspace reset metadata, and make reset recreate the sandbox while clearing command history, shells, and services without changing the workspace identity or diff baseline.
Refresh the 2.8.0 docs, roadmap, and Python example around reset-over-repair, then validate with uv lock, UV_CACHE_DIR=.uv-cache make check, UV_CACHE_DIR=.uv-cache make dist-check, and a real guest-backed create/snapshot/reset/diff smoke test outside the sandbox.
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.
