Add /compact command for manual conversation compaction

[Copilot]

Adds a /compact slash command to manually trigger conversation summarization, giving users explicit control over context compaction rather than relying solely on automatic triggers.

Changes

• New CompactIntent (src/extension/intents/node/compactIntent.ts)

  • Implements handleRequest to directly process summarization
  • Uses existing ConversationHistorySummarizationPrompt infrastructure
  • Panel-only (where conversation history exists)

• Intent registration

  • Added Compact to Intent enum
  • Mapped 'compact' → Intent.Compact under @workspace agent
  • Registered in IntentRegistry

• Package manifest

  • Added command definition to @workspace participant in package.json
  • Added localization strings in package.nls.json

Usage

@workspace /compact

Outputs a summary of the conversation history to reduce context size for subsequent requests.

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