[help wanted] CI workflow for E2E perf benchmark (TTI / store / Tauri RSS)

[GoDiao]

Background

The repo already contains an E2E benchmark suite (store-e2e, TTI, Tauri RSS) added during Phase 2.5. We want to run it on every PR and post the result back as a comment so we can catch performance regressions early.

Tasks

• Add .github/workflows/perf.yml triggered on pull_request
• Run bun install + bun test for the benchmark suite
• Capture metrics into a JSON artifact
• Post (or update) a sticky PR comment with a markdown table of metrics
• Compare against master baseline; fail or warn when a metric regresses by more than X%
• Document thresholds in docs/perf-optimization-report.md

Files

• .github/workflows/perf.yml (new)
• benchmark scripts already in repo
• docs/perf-optimization-report.md

Difficulty / Estimate

⭐⭐⭐ — full day; needs Actions + comparing JSON across runs.

Mentor

Maintainer can share the existing benchmark scripts and baseline numbers.