docs(shared-slots): rename @statewalker/workspace-api → @statewalker/workspace

Per umbrella's workbench-substrate-shape-cleanup change, the workspace
package was renamed and the README reference is updated to match.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: mkotelnikov

packages/shared-slots/README.md

@@ -102,7 +102,7 @@ extensible).
 - `@statewalker/shared-intents` — the sibling RPC bus.
 - `@statewalker/shared-registry` — LIFO cleanup for
   `provide` / `observe` disposers.
-- `@statewalker/workspace-api` — the `Workspace` adapter host.
+- `@statewalker/workspace` — the `Workspace` adapter host.
 
 ## License