RepoWorkspace is a platform primitive, not a ship internal

Move RepoWorkspace from druks.contrib.ship.workspace to a new top-level
druks.workspaces module, beside druks.workflows and druks.agents, so any
app can subclass it without depending on ship's package. druks.workspaces
also re-exports the base Workspace, giving apps one import for both.

Ship, review, and the profiler keep it unchanged — a pure move. The sandbox
layer stays free of GitHub and account semantics.

Author: czpython

backend/druks/contrib/review/workflows.py

@@ -5,12 +5,12 @@
 from druks.contrib.review.datastructures import PullRequest
 from druks.contrib.review.github import get_review_actor
 from druks.contrib.ship.models import ProjectRepo
-from druks.contrib.ship.workspace import RepoWorkspace
 from druks.core.apis.github import GITHUB
 from druks.sandbox import repo as _repo
 from druks.sandbox.layout import get_github_token_remote_path, get_related_root, get_repo_root
 from druks.services.models import ServiceIdentity
 from druks.workflows import Workflow
+from druks.workspaces import RepoWorkspace
 
 if TYPE_CHECKING:
     from druks.sandbox.host import Sandbox

backend/druks/contrib/ship/workflows.py

@@ -27,13 +27,13 @@
 from druks.settings import load_settings
 from druks.skills.models import Skill
 from druks.workflows import FatalError, Workflow, step
+from druks.workspaces import RepoWorkspace
 
 from .app import Ship
 from .constants import GITHUB_MCP_NAME, GITHUB_MCP_URL
 from .journal import BuildJournal
 from .policy import PlanGate, RepoPolicy
 from .prompt_context import BuildPromptContext
-from .workspace import RepoWorkspace
 
 if TYPE_CHECKING:
     from druks.sandbox.host import Sandbox

backend/druks/contrib/ship/workspace.py backend/druks/workspaces.pybackend/druks/contrib/ship/workspace.py renamed to backend/druks/workspaces.py

@@ -5,14 +5,14 @@
 from typing import Any
 
 import pytest
-from druks.contrib.ship import workspace as workspace_mod
+from druks import workspaces as workspace_mod
 from druks.contrib.ship.constants import GITHUB_MCP_NAME, GITHUB_MCP_URL
 from druks.contrib.ship.workflows import Build, BuildWorkspace
-from druks.contrib.ship.workspace import RepoWorkspace
 from druks.mcp.helpers import get_bearer_token_env_var
 from druks.sandbox import host as host_mod
 from druks.sandbox.layout import get_related_root, get_repo_root
 from druks.workflows import FatalError
+from druks.workspaces import RepoWorkspace
 
 
 class _FakeSandbox: