feat(vscode): notify on matching marketplace items

[markijbema]

Chained on top of #11640 (mark/marketplace-relevance-filter).

Builds on the workspace-relevance filter by proactively surfacing matches as a native VS Code notification, so users discover relevant skills/agents/MCP servers without opening the marketplace.

What

• A background MarketplaceNotifier scans the workspace shortly after activation (and on workspace-folder/extension/file changes), reusing the existing relevance detection.
• When a non-installed item's suggest_for metadata matches, it shows a toast: Install and Don't show again.
• Install opens the marketplace panel's existing install dialog for that item, with project scope preselected — so scope/parameter selection still happens in the normal popup.
• Don't show again persists a stable, discardable type:id slug in globalState; dismissed items never re-notify and the list is cleared on settings reset.

Why

The relevance filter only helps users who already opened the marketplace. This closes the loop by bringing relevant suggestions to them, while keeping them fully discardable and non-repeating.

Notes

• Only one suggestion is surfaced per scan to avoid stacking toasts.
• Selection logic (selectSuggestions / suggestionSlug) is pure and unit-tested without VS Code.

Screenshots:

After clicking install

[kilo-code-bot]

Code Review Summary

Status: 1 Issue Found | Recommendation: Address before merge

Overview

Severity	Count
CRITICAL	0
WARNING	1
SUGGESTION	0

Fix these issues in Kilo Cloud

Issue Details (click to expand)

WARNING

File	Line	Issue
packages/kilo-vscode/src/services/marketplace/notifier.ts	114	Closing the toast suppresses the suggestion for the rest of the session.

Files Reviewed (1 file)

• packages/kilo-vscode/src/services/marketplace/notifier.ts - 1 issue

Previous Review Summary (commit 80ed571)

Current summary above is authoritative. Previous snapshots are kept for context only.

Previous review (commit 80ed571)

Status: 2 Issues Found | Recommendation: Address before merge

Overview

Severity	Count
CRITICAL	0
WARNING	2
SUGGESTION	0

Fix these issues in Kilo Cloud

Issue Details (click to expand)

WARNING

File	Line	Issue
packages/kilo-vscode/src/services/marketplace/notifier.ts	112	Closing the toast suppresses the suggestion for the rest of the session.
packages/kilo-vscode/src/services/marketplace/notifier.ts	115	A later rescan can drop the user's notification choice.

Files Reviewed (9 files)

• .changeset/marketplace-match-notification.md
• packages/kilo-vscode/src/KiloProvider.ts
• packages/kilo-vscode/src/MarketplacePanelProvider.ts
• packages/kilo-vscode/src/extension.ts
• packages/kilo-vscode/src/services/marketplace/notifier.ts - 2 issues
• packages/kilo-vscode/src/services/marketplace/notify.ts
• packages/kilo-vscode/tests/unit/marketplace-notify.test.ts
• packages/kilo-vscode/webview-ui/src/components/marketplace/MarketplaceView.tsx
• packages/kilo-vscode/webview-ui/src/types/messages/extension-messages.ts

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