feat(github-app): render slop band in PR panel (visual)

[JSONbored]

Parent roadmap: #525
Parent epic: #532

Visual / rendering task — lower priority; likely owner-led.

Goal

Render the slop band/risk in the existing PR panel comment (the check-output text wiring is non-visual; the panel presentation is the visual part).

Reuse

buildPublicPrIntelligenceComment (engine.ts:3549); slop findings already public-safe.

Acceptance

Panel shows the slop band with public-safe reasons; no private-term leakage.

Testing

npm run test:ci, 97%+ coverage. Sanitizer + render tests.

[JSONbored]

Reclassified as owner-led visual work (assigned to @JSONbored). This is not a Gittensor-scored contributor task — visual/UI changes are handled by the maintainer to keep review tractable. Forthcoming visual-PR auto-review tooling (before/after screenshots) will make such changes reviewable. Roadmap: #525.

[JSONbored]

Verified shipped via #726 (2026-06-17 triage). PR panel renders the slop band pill + risk (apps/gittensory-ui/.../maintainer-panel.tsx:298-326, SLOP_BAND_TONE); assessment persisted (processors.ts:1194-1196, migration 0035); public-safe. Check-output text wiring handled separately by #721. Closing.