[Refactor][Build] Remove dead code and add dev toolchain (knip, coverage, Renovate, VSCode)

[samzong]

Summary

Remove 52 dead code items identified by knip static analysis, then add three dev toolchain enhancements: automated dependency updates (Renovate), test coverage visibility (vitest v8), and contributor DX (VSCode workspace settings).

Type of change

• [Refactor] internal cleanup
• [Build] CI, packaging, or tooling change

Why is this needed?

ClawWork had zero dead code detection — unused exports, dead files, and orphaned types accumulated silently. As an open-source project with growing contributors, the codebase needs automated guardrails to prevent dead code from re-entering, dependency rot from going unnoticed, and test coverage from being invisible.

What changed?

Commit 1 — Dead code cleanup + knip:

• Installed knip, configured for the monorepo (shared/desktop/website with Electron multi-entry)
• Removed 1 dead file (useTheme.ts), 2 dead functions (removeDeviceToken, useTheme/useResolvedTheme hooks), 1 dead component (TabsContent), 1 dead constant (EMPTY_ARTIFACTS), 8 dead types
• Removed unnecessary export from 39 symbols only used file-internally
• Stripped dead re-exports from shadcn/ui barrel exports (dialog, scroll-area, tabs, button)
• Added pnpm check:dead-code to pnpm check gate and CI pipeline

Commit 2 — Renovate + Coverage + VSCode:

• Added renovate.json: weekly schedule, patch automerge, Electron major pinned, Radix UI grouped
• Added @vitest/coverage-v8 to both shared and desktop, CI now runs pnpm test:coverage
• Added .vscode/settings.json and .vscode/extensions.json with Prettier, ESLint flat config, TS workspace SDK, Tailwind IntelliSense

Architecture impact

• Owning layer: shared / main / preload / renderer (all touched — dead export removal only)
• Cross-layer impact: none — pure deletion of unused exports, no behavior change
• Invariants touched from docs/architecture-invariants.md: none
• Why those invariants remain protected: only export keywords removed or dead code deleted; zero runtime behavior change

Linked issues

N/A

Validation

• pnpm lint
• pnpm test
• pnpm check:ui-contract
• pnpm check (full gate: lint + architecture + ui-contract + renderer-copy + i18n + dead-code + format + typecheck + test)
• pnpm test:coverage (coverage reports generated successfully)

pnpm check — all gates pass, 98 tests green
pnpm test:coverage — shared: 54.8% stmts, desktop: coverage report generated
pnpm check:dead-code (knip) — zero findings

Screenshots or recordings

N/A — no UI changes.

Release note

• No user-facing change. Release note is NONE.

NONE

Checklist

• The PR title uses at least one approved prefix: [Refactor], [Build]
• The summary explains both what changed and why
• Validation reflects the commands actually run for this PR
• Architecture impact is described and references any touched invariants
• Cross-layer changes are explicitly justified
• The release note block is accurate

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