docs: Add archival/pruning test checklist to CONTRIBUTING

[diberry]

Problem

The nap.ts archival bugs were shipped with 38 tests — but only 2 covered archival, both happy-path. No checklist exists for required edge cases when writing archival/pruning functions.

From

Postmortem action item A6.

Proposed

Add to CONTRIBUTING.md or .squad/skills/nap/SKILL.md: any archival/pruning function MUST test:

• Undated entries (no YYYY-MM-DD in heading)
• All-recent entries (all <30 days old, file over threshold)
• Empty file / single entry
• Mixed dated + undated entries
• Data-loss invariant (before_count = kept + archived)
• Realistic fixture (sample from actual repo's decisions.md)

Owner

Procedures (Prompt Engineer)

[github-actions]

🏗️ Squad Triage — Flight (Lead)

Issue: #26 — docs: Add archival/pruning test checklist to CONTRIBUTING
Assigned to: FIDO (Quality Owner)
Reason: Issue relates to testing/quality work

@copilot evaluation: No strong capability match — routed to squad member.

Team roster:

• Flight (Lead) → label: squad:flight
• Procedures (Prompt Engineer) → label: squad:procedures
• EECOM (Core Dev) → label: squad:eecom
• FIDO (Quality Owner) → label: squad:fido
• PAO (DevRel) → label: squad:pao
• CAPCOM (SDK Expert) → label: squad:capcom
• CONTROL (TypeScript Engineer) → label: squad:control
• Surgeon (Release Manager) → label: squad:surgeon
• Booster (CI/CD Engineer) → label: squad:booster
• GNC (Node.js Runtime) → label: squad:gnc
• Network (Distribution) → label: squad:network
• RETRO (Security) → label: squad:retro
• INCO (CLI UX & Visual Design) → label: squad:inco
• GUIDO (VS Code Extension) → label: squad:guido
• Telemetry (Aspire & Observability) → label: squad:telemetry
• VOX (REPL & Interactive Shell) → label: squad:vox
• DSKY (TUI Engineer) → label: squad:dsky
• Sims (E2E Test Engineer) → label: squad:sims
• Handbook (SDK Usability) → label: squad:handbook
• Ralph (Work Monitor) → label: squad:ralph
• @copilot (Coding Agent) → label: squad:copilot

To reassign, remove the current squad:* label and add the correct one.

[diberry]

Closing: work completed upstream or no longer relevant. See diberry/project-dina#22 cleanup audit.