Add performance tests

[pwang347]

No description provided.

[github-actions]

Screenshot Changes

Base: cf7f246a Current: f6709ed7

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[Copilot]

Pull request overview

Adds a new chat-focused performance benchmarking harness to the repository, including a CI workflow for comparing baseline vs test builds. This fits into the existing scripts/ perf tooling by providing repeatable end-to-end chat timing/rendering/memory measurements backed by a deterministic mock LLM server.

Changes:

• Introduce chat perf regression runner + leak checker scripts under scripts/chat-perf/ (Playwright + CDP-based metrics).
• Add a local mock LLM server and shared utilities for build resolution, launch args/env, and statistical comparison.
• Wire up npm scripts, CI workflow, and documentation for running these benchmarks.

Show a summary per file

File	Description
scripts/chat-perf/test-chat-perf-regression.js	Runs scenario-based chat perf benchmarks and compares against a baseline build.
scripts/chat-perf/test-chat-mem-leaks.js	Sends repeated chat messages in one session and detects monotonic heap/DOM growth.
scripts/chat-perf/common/utils.js	Shared helpers for build download/launch configuration and statistics.
scripts/chat-perf/common/mock-llm-server.js	Local deterministic streaming server that emulates Copilot/OpenAI-style endpoints.
package.json	Adds perf:chat and perf:chat-leak npm entry points.
.gitignore	Ignores .chat-perf-data output directory.
.github/workflows/chat-perf.yml	Adds a manual workflow to compare baseline vs test build performance and publish artifacts/summary.
.github/skills/chat-perf/SKILL.md	Documents how to run the new perf and leak tools and interpret results.

Copilot's findings

• Files reviewed: 7/8 changed files
• Comments generated: 8