Replace inline workspace path computation in loop_context.go with composable
WorkspaceLayer pipeline (tenant → team → project → user/chat). Each layer is
a pure function that appends a path segment or is a no-op.
- New workspace_resolver.go: ResolveWorkspace, TenantLayer, TeamLayer,
ProjectLayer (future), UserChatLayer, SanitizePathSegment
- 16 unit tests covering all layer combinations
- Migrate loop_context.go, loop_history.go, team_tasks_mutations.go
- Move sanitizePathSegment from agent to tools package (exported)
- Zero behavior change — identical paths for all scenarios
viettranx
4b780bbffa