Add VS code marketplace extension

[deb-adarsh]

No description provided.

[Copilot]

Pull request overview

Adds a Visual Studio Code Marketplace extension for AI Stack Kit, alongside web-UI improvements (module-type filtering, URL-synced filters, toast feedback, getting-started panel, Docs link) and supporting CLI/schema changes that make the headless extension flow possible.

Changes:

• New VS Code extension surface (commands, modules/outputs trees, catalog webview) plus CI workflow to package/publish it.
• Web Skill browser re-themed as a Module browser with module-type filter, URL-synced filter state, copy toasts, getting-started steps, and empty state.
• Core changes: SpecFileSchema no longer requires at least one entry (enables empty init), apply-pipeline gains forceReinstall, and new pipeline/spec-loader tests.
• Docs (USER_GUIDE.md) and template (templates/spec.yaml) updated to describe the extension and the built-in cursor | copilot | claude adapters.

Reviewed changes

Copilot reviewed 61 out of 69 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
web/src/index.css	Styles for new hero docs link, getting-started block, empty state, toast, and module-type tag.
web/src/App.tsx	Adds URL-synced filters, module-type filter, copy toasts, getting-started UI, and Docs link.
USER_GUIDE.md	Documents the new Marketplace extension, UI areas, settings, and dev workflow.
templates/spec.yaml	Updates the client.type comment to reflect built-in adapters.
src/validation/schema.ts	Removes the "at least one skill/module" superRefine to allow empty starter specs.
src/pipeline/apply-pipeline.ts	Adds forceReinstall option that wipes the install dir before reinstall.
src/pipeline/tests/spec-loader.test.ts	New tests for loadSpec including empty-skills and missing-client cases.
src/pipeline/tests/apply-dry-run.test.ts	New dry-run test for the apply pipeline.

Files not reviewed (1)

• extension/webview-ui/package-lock.json: Language not supported

Comments suppressed due to low confidence (2)

web/src/App.tsx:292

• The stats line and the empty-state message now both say "modules", but the input's aria-label is still "Search skills" (line 277, just above this block) and the filter select for module type uses the select-client CSS class designed for the client dropdown. Update the accessible label to "Search modules" and/or rename the CSS class to keep the terminology and styling intent consistent now that the UI is a module browser, not a skill browser.
  web/src/App.tsx:236
• The header still reads "Skill browser" (line 235), and the search input's aria-label is "Search skills", but the rest of the page has been re-themed around "modules" (stats line, empty-state, module-type filter, module-type tag). The mismatched terminology will be confusing to users and screen-reader users alike. Consider updating the sub-title and aria-label to "Module browser"/"Search modules" for consistency.

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