Make workspace cwd optional to support repo-only workspaces that don't require
a local directory. Refactor workspace resolution in heartbeat service to pass
all workspace hints to adapters, add fallback logic when project workspaces
have no valid local cwd, and improve workspace name derivation. Also adds limit
param to heartbeat runs list endpoint.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
New project_workspaces table with primary workspace designation.
Full CRUD routes, service with auto-primary promotion on delete,
workspace management UI in project properties panel, and workspace
data included in project/issue ancestor responses.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
