Add Workspace Management Commands

[fredvisser]

Adds comprehensive workspace management capabilities with read-only operations and administrative functions.

Key Changes:

• New workspace commands: list, info, and disable for workspace administration
• Consistent table formatting: Updated all list commands (templates, workflows, notebooks, workspaces) to use unified box-drawing character styling
• Command naming: Renamed all commands from plural to singular forms (templates → template, workflows → workflow, etc.)
• Enhanced utilities: Added workspace mapping functions and improved error handling
• Documentation: Updated README with workspace management section and CLI best practices
• Test coverage: Added comprehensive test suite for workspace operations (9 tests)

Workspace Features:

• List workspaces with filtering (by name, include disabled)
• Get detailed workspace info (contents: templates, workflows, notebooks)
• Disable workspaces with confirmation prompts
• JSON and table output formats for all commands

[Copilot]

Pull Request Overview

Adds comprehensive workspace management functionality to the SystemLink CLI with read-only operations and administrative capabilities, while modernizing command naming and visual formatting across all CLI modules.

• New workspace management commands: list, info, and disable for workspace administration with filtering and comprehensive content details
• Command naming modernization: Changed all command groups from plural to singular forms (templates → template, workflows → workflow)
• Visual consistency improvements: Unified table formatting with box-drawing characters across all list commands (templates, workflows, notebooks, workspaces)

Reviewed Changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
slcli/workspace_click.py	Implements new workspace command group with list, info, and disable operations
slcli/main.py	Registers workspace commands with CLI
slcli/utils.py	Updates workspace mapping utilities with enhanced error handling
slcli/workflows_click.py	Renames command group and updates table formatting
slcli/templates_click.py	Renames command group and updates table formatting
slcli/notebook_click.py	Updates table formatting for consistency
tests/unit/*	Updates test references to use new singular command names
README.md	Updates documentation with workspace management section and new command names