Test: Auto Completions and Invoking Copilot Slash Commands

[DonJayamanne]

Refs: #297117

• anyOS @sandy081
• anyOS @bamurtaugh

Complexity: 3

Create Issue

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Setup:

• Use Copilot Agent Host Sessions
• Use VS Code or Agent Window

Steps:

• Start a new session or open an existing session
• Type / into an empty chat input
• Verify you get completions for Copilot CLI slash commands like /init /compact, /env, '/usage, /fleet` & the like
• Verify you get descriptions for each of the commands
• Some commands have additional sub commands or options, e.g. /memory can be turned on or off using /memory on or /memory off

Known issues:

• Sub commands don't contain meaningful descriptions, there's is an upstream issue for this
  Sub commands for Copilot CLI slash commands don't contain meaningful docs/descriptions #323401