feat(tracking): tag agent-connected requests with client=mcp

[tonychang04]

Summary

• UsageTracker.reportAgentConnected() now sends client: 'mcp' in the request body to /tracking/v1/agent-connected.
• Adds an assertion in usage-tracker.test.ts to lock in the new behavior.

Why

Pairs with insforge-cloud-backend#472, which adds an optional client field on the cloud endpoint so PostHog/Mixpanel can break down agent-connected events by source. Without this MCP-side change, every MCP session reports as client: 'unknown' and is indistinguishable from CLI traffic.

Test plan

• Connect any MCP client (Claude Code, Cursor, etc.) to a project, watch the /tracking/v1/agent-connected request body — should include "client":"mcp"
• Verify cloud-side event in PostHog shows client=mcp property
• npm test passes

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 9606df8e-c0f9-4689-a212-6857baa8837c

📥 Commits

Reviewing files that changed from the base of the PR and between 0ae2fa4 and 9f1c962.

📒 Files selected for processing (2)

• src/shared/usage-tracker.test.ts
• src/shared/usage-tracker.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch track-agent-source-client

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