Implement intelligent chat history cutoff for remote agent job creation

[Copilot]

This PR addresses the TODO comment in CreateRemoteAgentJobAction by implementing a smart history cutoff mechanism that determines when to stop including earlier chat history when delegating to remote coding agents.

Problem

Previously, all chat requests in a session were included when creating remote agent jobs, which could:

• Send irrelevant old conversations to remote agents
• Consume unnecessary tokens and degrade performance
• Lack focus on the current task context

Solution

Implemented an intelligent cutoff system with three strategies:

1. Coding Agent Delegation Detection

When a previous delegation to a coding agent is found, the history starts from that conversation point. Detection works by identifying:

• Agent IDs containing 'coding' or 'remote'
• User messages containing 'delegate' (case-insensitive)

2. Configurable Maximum Limit

Added new setting chat.maxHistoryEntriesForRemoteAgent (default: 20, range: 1-100) that limits history when no previous coding agent delegation is detected.

3. No Cutoff for Small Histories

When chat history is within the configured limit and no coding agent is found, all entries are preserved.

Example Behavior

// Scenario 1: Previous coding agent found
// History: [msg1, msg2, coding-agent-delegation, msg3, msg4]
// Result: Includes [coding-agent-delegation, msg3, msg4]

// Scenario 2: No coding agent, exceeds limit (max=20, actual=25)  
// Result: Includes last 20 messages

// Scenario 3: No coding agent, within limit (max=20, actual=15)
// Result: Includes all 15 messages

Additional Features

• Telemetry Integration: GDPR-compliant tracking of cutoff usage patterns
• Comprehensive Tests: Full test coverage for all cutoff scenarios
• Backward Compatible: Maintains reasonable defaults without breaking existing workflows

The implementation prioritizes relevant recent context while giving users control over history limits, improving both performance and task focus for remote coding agent delegations.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• electronjs.org
  • Triggering command: node-gyp (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Created from VS Code via the GitHub Pull Request extension.

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