log-frame: migrate `plan-resumed` role from ink to frame

[esengine]

Context

src/cli/ui/log-frame.tsx walks each DisplayEvent and either produces a frame atom (row-precise scroll, deterministic layout) or falls back to a legacy ink atom (snap-to-boundary scroll, height estimate). The remaining ink fallbacks are listed in the comment around eventToAtom:

// Fall back to legacy Ink rendering for roles we haven't migrated
// (currently: streaming assistant, plan-replay, plan-resumed; …)

We want to migrate them one by one. This issue is about plan-resumed.

What plan-resumed renders

When a session is resumed and a previously-saved plan is reattached. Existing renderer lives in src/cli/ui/EventLog.tsx around line 444. The event payload is on event.resumedPlan ({ steps, ... }).

Task

1. Add a planResumedFrame(event, width): Frame builder in log-frame.tsx, near the existing planFrame / ctxBreakdownFrame helpers.
2. Wire it into the dispatch in eventToAtom so event.role === 'plan-resumed' returns { kind: 'frame', ... } instead of falling through to ink.
3. Visually match the legacy <EventRow event={event} /> output — header pill + indented step list + any meta lines. Use the existing primitives (borderLeft, vstack, pad, text, rowFrame).
4. No tests required, but a manual check via npm run dev + a session that has a resumed plan should look identical row for row.

Why it's a good first PR

• Self-contained: one new function + one branch in the dispatch.
• The planFrame next door is the closest pattern to copy.
• No behavior change for any other role.

Tag me on the PR if you get stuck on width budgets or cell layout.