`ThreadDataMiddleware.before_agent` now reads
`get_effective_workspace_id()` and routes the per-thread directory tree
through `Paths.sandbox_*_dir(thread_id, workspace_id=...)`, producing
`{base_dir}/workspaces/{wid}/threads/{tid}/user-data/...`. The legacy
user-id-only layout is no longer written by this middleware; the
migration script in T6.12 will lift any pre-existing `users/{uid}/...`
trees into the new shape.
In no-auth dev mode the contextvar is empty so
`get_effective_workspace_id` returns `"default"` and writes land at
`workspaces/default/...` — the layout invariant ("threads always live
inside a workspace") holds without a real auth setup. `thread_data` now
also exposes `user_id` and `workspace_id` so downstream middlewares
(sandbox, memory, etc.) can read them without re-resolving the
contextvar themselves.
4 new tests cover: contextvar workspace → expected path,
`no_auto_workspace` falls back to `default`, eager mode creates the
right dirs, and the `get_config` fallback still routes through
workspace. Existing 4 thread_data middleware tests stay green.
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