fix: preserve quality reports in scheduled audit completion

[atomantic]

Summary

Scheduled audits could finish without saving dashboard quality: the issue-only completion workflow asked for a one-line summary despite the audit mission requiring a structured report. Preserve required reports in that workflow and add an explicit, category-specific sentinel handoff for both TUI and CLI audit agents.

Explain why completed maintenance may have no saved assessment, and distinguish saved but excluded evidence from an app that has never been assessed. Existing scoring thresholds remain unchanged; historical runs without reports cannot supply a score.

Test plan

• 419 server tests passed across scheduled audit prompt generation, agent prompt building, quality persistence/aggregation, and import boundaries.
• 4 AppQuality component tests passed, including missing reports and excluded assessments.
• Focused client lint and git diff whitespace checks passed.
• Reviewed changed code for reuse, quality, efficiency, and private-data exposure.