test(examples-chat): aimock structured-markdown scenarios — Phase 2b

[blove]

Summary

Adds three Playwright scenarios that exercise structured markdown rendering through the Phase 2a harness:

• Heading — asserts the assistant bubble renders an <h1> with the expected text.
• Code fence — asserts a <pre><code> block with the expected snippet.
• Bullet list — asserts a <ul> with three <li> in order.

Extends the harness runner to load a directory of fixture files (each can carry one or more match/response entries), so future scenario phases keep being small additive PRs that don't touch runner code.

Sits on Phase 2a (#309). Plan: docs/superpowers/plans/2026-05-14-aimock-markdown-scenarios.md.

Test plan

• Runner unit tests pass: 3/3 (added one for directory mode)
• Full Playwright suite passes locally: 4/4 (1 smoke + 3 markdown), confirmed across two consecutive runs
• Existing Phase 2a smoke spec still passes after the directory-mode default switch
• No production code touched
• CI green on this PR

Notes for reviewers

• The implementer hit one transient first-run flake on the bullet-list test that cleared on retry. Worth keeping an eye on if it recurs in CI; if so, raise the in-bubble assertion timeout or insert a brief settle wait. Not addressed in this PR — fix-on-demand is cheaper than over-correcting now.
• The sendPrompt helper in markdown.spec.ts lives inline. If Phase 2c wants the same helper, extract then.

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Project	Deployment	Actions	Updated (UTC)
cacheplane	Ready	Preview, Comment	May 14, 2026 4:41am