- Append form (text + email + password + submit) + table (thead + 2 rows)
+ modal trigger + hidden modal div below existing `<pre id="status">`
scaffold; preserves `<head>` block + tokens.css link untouched (A18/A21
invariant).
- Modal trigger uses inline onclick to toggle style.display — rrweb
records the attribute mutation, satisfying IncrementalSnapshot
emission per RESEARCH Pitfall 1 (synthetic probe HTML emits Meta +
FullSnapshot but NOT IncrementalSnapshot without a DOM mutation
between page load and SAVE).
- Per RESEARCH Pitfall 4: the rrweb-alpha.4-leaky multi-line input
element (rrweb-io/rrweb#1596) is excluded; only single-line inputs.
- Per UI-SPEC §"Test Fixture Conventions": data-test-* attributes
only; no data-mokosh-* (production-welcome-page reserved); no
tokens.css import on the probe sub-tree (head already imports the
canonical tokens for A18/A21).
- npm run build exit 0; all 7 acceptance grep gates GREEN.