test(browser): wait for cadence editor hydration - #5738

Goal And Delivered Outcome

• Outcome basis / optional anchor: Self-contained packaged browser-smoke reliability fix.
• Goal/source and gap: The typed-actions scenario read cadence fields as soon as they became visible, before the saved v0 cadence had hydrated into the v1 editor.
• Observable before → after, with the validation row that proves it: At base cf1f686cc517e844a164ac0f45fda7132d9c82b2, the packaged scenario could observe an empty unit instead of completed_todos. It now waits for the saved unit and count before asserting them; the rebased candidate passes the full packaged smoke.
• Issue/task and intended base: No issue; intended base main at 77d23b7c09d6c1ee816d0c380c9935fbc67149f2.

Author Declaration

• Written by: model_agent — OpenAI Codex (GPT-6 family).

Implemented against

• Specification and revision: No separate written specification; the request in this PR is the basis. The test contract is the saved cadence projection into the v1 editor in examples/personal-workspace-browser/typed-actions.mjs at 77d23b7c09d6c1ee816d0c380c9935fbc67149f2.
• Criteria:

• Self-check before submission: Reproduced the transient empty value on base cf1f686cc; confirmed the full packaged smoke passes after waiting for editor initialization.

Scope And Continuation

• Completed scope and remaining work: Synchronize the browser assertion with cadence editor initialization; no product runtime behavior changes.
• Slice boundary / successor: Complete within this scope.

Validation

• Tested revision: 5e004e7df9783a8380f01d27048fd7068437b6a1 (same candidate code as current head e06eae1f6fd8f5e2055630224d6ba46f401285a5; the later rebase added only an upstream documentation commit)
• Run state: finished
• Input classes: synthetic

• Coverage and gaps: The full packaged browser smoke covers the changed assertion; no runtime paths changed.

Frontend / Visual Evidence

• UI impact: none
• Before: N/A
• After: N/A
• States and viewports shown: N/A
• Source data: synthetic
• Attention review: N/A; no product UI changed.

Type of Change

• Bug fix
• New feature
• Breaking change
• Refactoring (no functional changes)
• Documentation update
• Test update

LoopX Area

• Control plane (goals, todos, quota, scheduler, registry, runtime)
• Benchmark boundary (adapters, runners, verifiers, scoring, evidence)
• Capability or extension (providers, adapters, skills)
• Public docs or presentation surface (README, protocols, dashboard)
• Build, packaging, installer, or CI
• Host or runtime integration

Technical Direction

• Direction / acceptance reference, when applicable: N/A; no product or roadmap behavior changes.

Shared-authority RFC fixture impact

• Production-scale fixture schema: N/A
• Semantic dimensions changed, or reviewed no-impact rationale: N/A; no shared-authority fixture changed.
• Provider conformance arms run: N/A
• Read-only legacy/file/PostgreSQL three-arm rehearsal: N/A

Boundary Checklist

• Neither the diff nor this PR body/comments/attachments disclose private state, credentials, raw traces or verifier output, internal links, or local machine paths.
• I did not duplicate maintainer-owned benchmark work.
• I kept the change scoped to the self-contained browser-smoke fix.
• I completed the visual evidence section and marked UI impact none.
• Every commit includes a DCO Signed-off-by trailer.