test(desktop): enforce full configured coverage

[seonghobae]

Summary

• raise the configured desktop Vitest coverage thresholds from 90% to 100% for lines, functions, branches, and statements
• document the enforced coverage baseline and changelog entry

Verification

• npm run test --workspace apps/desktop — 216 passed; 100% lines/functions/branches/statements
• npm run lint --workspace apps/desktop
• npm run typecheck --workspace apps/desktop
• git diff --check
• python3 scripts/checks/verify_docs.py

Security Notes

• No new runtime boundary, dependency, URL, subprocess, IPC, file-ingestion, model, or export behavior is introduced.
• The stricter test gate fails closed when configured desktop source coverage regresses.

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📥 Commits

Reviewing files that changed from the base of the PR and between 749511c and f6e7d6e.

📒 Files selected for processing (3)

• CHANGELOG.md
• apps/desktop/vite.config.ts
• docs/engineering/acceptance-criteria.md

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.

[seonghobae]

Current-head coverage evidence for f6e7d6e6ee12bd0e6c8e378ca100aabb4f11352c exposed a central workspace-install defect: the trusted coverage lane discovered apps/desktop but checked only that directory for package-lock.json, while this npm workspace owns the lock at repository root. Central .github PR #1411 fixes the bounded ancestor-lock installation and adds a regression contract: ContextualWisdomLab/.github#1411

The product PR remains unchanged and its local/hosted product checks are passing; no merge is requested until the central coverage gate is repaired and fresh exact-head evidence is produced.