Summary: This PR expands GitKraken MCP setup so users can connect MCP to additional detected “agent” clients (beyond the current host IDE).

Changes:

• Added a new command gitlens.ai.mcp.selectAgents and surfaced it via command palette/menu contributions.
• Introduced an agent picker UI and CLI-backed agent discovery via gk mcp install --list --json.
• Implemented multi-agent MCP installation flow with progress reporting and per-agent success/failure/user-action results.
• Updated MCP onboarding surfaces (welcome message, welcome page, home banner, integrations chip) to offer “Connect More Agents”.
• Added telemetry for agent selection (mcp/agents/selected) and refactored MCP setup error normalization/telemetry tracking.

Technical Notes: Installation is delegated to the GitKraken CLI per-agent (gk mcp install <agent>) and results are aggregated to drive user messaging and completion telemetry.

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