test: allow e2e suite to run against dist bundle

[ThomasK33]

Run make build before playwright to provide dist artifacts when needed.
Gate dist mode behind CMUX_E2E_LOAD_DIST and assert required files.
Skip the dev server and launch electron with production env when set.
Enable parallel playwright workers to keep runtimes acceptable.

[chatgpt-codex-connector]

💡 Codex Review

cmux/playwright.config.ts

Lines 8 to 12 in 4f92a5c

	expect: {
	timeout: 5_000,
	},
	fullyParallel: true,
	forbidOnly: isCI,

Running e2e tests in parallel conflicts with fixed dev server port

Enabling fullyParallel means multiple Playwright workers execute the e2e project simultaneously, but tests/e2e/electronTest.ts still spawns a Vite dev server on the hard‑coded port 5173 for every test. When the suite is run locally without CMUX_E2E_LOAD_DIST=1 (the default today), the second worker tries to start another dev server on the same port and exits immediately, causing nondeterministic failures. Consider keeping the project single‑threaded when the dev server is involved or allocate unique ports per worker.

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

[ThomasK33]

💡 Codex Review

cmux/playwright.config.ts

Lines 8 to 12 in 4f92a5c

	expect: {
	timeout: 5_000,
	},
	fullyParallel: true,
	forbidOnly: isCI,

Running e2e tests in parallel conflicts with fixed dev server port
Enabling fullyParallel means multiple Playwright workers execute the e2e project simultaneously, but tests/e2e/electronTest.ts still spawns a Vite dev server on the hard‑coded port 5173 for every test. When the suite is run locally without CMUX_E2E_LOAD_DIST=1 (the default today), the second worker tries to start another dev server on the same port and exits immediately, causing nondeterministic failures. Consider keeping the project single‑threaded when the dev server is involved or allocate unique ports per worker.

ℹ️ About Codex in GitHub

Fixed this

[ThomasK33]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. 🚀

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.