test(async): QA harness for async tag loading via the stub queue

[paragmore]

Reworked after the SURF-1936 move

The tag source now lives in surface_forms (packages/surface-scripts) and publishes to this repo. The stub-queue drain originally in this PR moved to trysurface/surface_forms#5844 (snippets: surface_forms#5841); this PR now carries only the manual QA harness, which belongs here with the rest of test/.

What

test/async-stub.html — loads the tag async with the install snippet's stub and constructs every embed before the tag arrives:

• slideover + popup (with prefillData) + inline + email input-trigger embeds, plus an early SurfaceSetConsent call
• ?tagDelay=<ms> injects the tag late (fast site / slow tag), ?noTag=1 never injects it (page must stay functional)
• live status panel: calls queued, drain status, stub re-pointing, iframe count (watch pre-loading), per-embed init state
• hooks event-monitor.js's sent-events wrapper via the store-setter trap (same as direct-iframe.html) so counters work with a late-loading tag

Note

The harness exercises the drain, so it goes green once surface_forms#5844 merges and the publish workflow updates surface_tag.js here. Verified locally against a build containing the drain: queue drains, all embeds initialize, 4 iframes preload, prefill reaches the store, kept stub references open the real forms, ?noTag=1 stays error-free.

🤖 Generated with Claude Code

https://claude.ai/code/session_013Kjq1CG5RwFMpeucoPJWML

[greptile-apps]

Greptile Summary

This PR adds a manual browser QA page for exercising async Surface tag loading through the install snippet’s stub queue and links it from the test-suite index.

• Covers queued consent and slideover, popup, input-trigger, and inline embed construction.
• Supports delayed or suppressed tag injection through query parameters.
• Displays queue, embed, iframe, and event-monitoring status for manual verification.
• Depends, as documented in the PR, on the queue-drain implementation and subsequent generated-tag publish from surface_forms.

Confidence Score: 5/5

The PR appears safe to merge, with its documented external publish dependency understood.

No actionable new defect remains in the added manual harness. All previous findings were resolved or correctly conceded, and the absent queue drain is an explicitly documented cross-repository sequencing dependency rather than a hidden regression in this PR.

_{Reviews (5): Last reviewed commit: "test(async): QA harness for async tag lo..." | Re-trigger Greptile}