feat(telemetry): add system metrics collection

[7Sageer]

Related Issue

No linked issue. This PR adds internal process resource telemetry for Kimi Code hosts.

Problem

Kimi Code telemetry currently has no visibility into host process resource usage. When investigating memory growth, CPU spikes, or resource exhaustion across CLI/TUI/server sessions, there is no runtime signal to correlate with existing telemetry events.

What changed

• Added a SystemMetricsCollector that emits a system_metrics telemetry event with CPU, memory, load, and process uptime fields.
• The collector performs one warmup sample shortly after startup so short-lived CLI runs still capture a baseline, then continues sampling every 30 seconds.
• Wired the collector into telemetry bootstrap so it follows the existing telemetry opt-in/opt-out path and attaches to the same telemetry client.
• Added lifecycle cleanup so replacing, disabling, shutting down, or resetting telemetry stops the collector and avoids duplicate interval timers.
• Added tests for warmup sampling, duplicate-start protection, collector replacement cleanup, and bootstrap-level system_metrics emission with session context.

Verification:

• pnpm --filter @moonshot-ai/kimi-telemetry test
• pnpm --filter @moonshot-ai/kimi-telemetry typecheck

Checklist

• I have read the CONTRIBUTING document.
• I have linked a related issue, or explained the problem above.
• I have added tests that prove my feature works.
• Ran gen-changesets skill, or this PR needs no changeset.
• Ran gen-docs skill, or this PR needs no doc update.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 69f826d

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[pkg-pr-new]

pnpm dlx https://pkg.pr.new/@moonshot-ai/kimi-code@69f826d

npx https://pkg.pr.new/@moonshot-ai/kimi-code@69f826d

commit: 69f826d