Display resolution metadata in plan status and plan serve

Acceptance Criteria

• plan status shows completion date and PR reference for recently done items (as shown in SPEC-027)
• plan status --format json includes resolution data in its output
• plan serve entity pages render the Resolution section with visual distinction (muted background, timestamp badge)
• Branch and PR values render as links in plan serve when patterns are recognised
• Unit tests for the status output formatting

Approach

In runes/plan/src/commands/status.ts, when listing done items, pull resolution.date and resolution.pr from the entity and format them inline. For plan serve, update the render pipeline to style ## Resolution sections distinctly — this likely means adding CSS and template logic in the serve command's rendering.

References

• Work Item Resolution Summaries
• Lumina Per-Rune Redundant CSS Cleanup — scanner resolution parsing (dependency)