fix(e2e): set webServer.cwd to repo root (refs #118)

[hyperpolymath]

Root cause

The Playwright workflow runs tests with working-directory: tools/compat-testing (see .github/workflows/e2e-playwright.yml:70). The webServer.command: 'deno task dev:vite' spawns vite from that same cwd. Vite uses process.cwd() as its project root by default — so it served files from tools/compat-testing/ (which has no index.html, no public/, no assets) rather than the repo root.

The smoking gun in the failed-run logs:

+ Failed to load http://localhost:1984/assets/main/ui.webp.json
+ TypeError: Failed to fetch
    at chunk-QIAJ6TT7.js (vite-bundled PixiJS Loader)
    at async Module.showScreen (Navigation.res.mjs:94)
    at async startApp (Main.res.mjs:101)

The assets exist at the correct paths (public/assets/main/ui.webp.json is checked in) — vite just couldn't serve them because its static-serve root was wrong. Subsequent Connection refused errors in the logs suggest vite then died from the avalanche of 404s.

Fix

Add cwd: '../..' to tools/compat-testing/playwright.config.js so vite starts at the repo root and serves public/, src/, index.html, and vite.config.js correctly.

Also added stdout/stderr: 'pipe' so vite startup logs surface in Playwright's output for future debugging.

What this doesn't fix (yet)

The Firefox-specific CanvasRenderer is not yet implemented error remains. PixiJS v8 has no Canvas2D fallback — Firefox in CI may need WebGL2 enabled explicitly or its WebKit/Firefox versions skipped until headless WebGL2 is reliable. Tracked alongside #118; this PR makes that the only remaining canvas-mount failure mode.

Test plan

• CI Playwright run on this branch boots vite from repo root.
• Chromium matrix loads /assets/main/ui.webp.json successfully.
• tests/game-loads.spec.js:47:3 › page loads without JavaScript errors reports a clean errors array (the asset-404 + chained Connection refused errors should be gone).
• Canvas-attach test for chromium-1080p / chromium-1440p passes; webkit/firefox WebGL issues remain as a separate sub-issue.

Refs #118.

🤖 Generated with Claude Code

[github-actions]

🔍 Hypatia Security Scan

Findings: 71 issues detected

Severity	Count
🔴 Critical	11
🟠 High	18
🟡 Medium	42

⚠️ Action Required: Critical security issues found!

View findings

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