refactor(vscode): share marketplace type contracts

[marius-kilocode]

What Problem This Solves

Marketplace contracts were declared separately in the extension host and webview, so their wire types could drift.

Why This Change Was Made

Use the existing, import-free host declarations as the canonical source through explicit type-only re-exports. Keep MarketplaceFilters webview-only and leave RawSkill and host result contracts unchanged. Remove only resolved duplication fingerprint 96a848236212dea1; all other ratchet bounds remain unchanged.

User Impact

No runtime behavior or wire-shape changes. Field optionality and discriminated unions are preserved. This removes 61 production lines without adding a shared module or runtime browser dependency.

Evidence

• Duplication report before/after: 38 to 37 pairs, 779 to 729 duplicated lines, 5201 to 5030 duplicated tokens. Prune and normal ratchet checks pass.
• All 29 existing marketplace tests pass. Package typecheck, lint, knip, compile (host and browser bundles), marker guard, formatting, and diff checks pass.
• Fresh visible isolated VS Code smoke loaded 323 public catalogue items. Category filtering returned 9 Business and 159 Data items; MCP filtering returned 126 items. Matching search, empty search results, filter reset, and full skill-description expand/collapse worked.
• Both local screenshots were visually reviewed. No installation/removal, credentials, or model prompts were used. Installation dialogs were not exercised. The console showed only a url.parse deprecation warning.
• Missing local dependencies were installed from the frozen lockfile before successful checks. An initial isolated launch failed; retry with shorter temporary paths succeeded. Isolated VS Code and its daemon were stopped, and their profiles were removed.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (2 files)

• packages/kilo-vscode/webview-ui/src/types/marketplace.ts
• script/kilocode-duplication-allowlist.json

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_{Review guidance: REVIEW.md from base branch main}