ci(vscode): add extension CI + Marketplace publish workflows

[platzhersh]

Summary

Brings the VS Code extension under CI and makes it publishable — the last open Phase 3D item. Until now, nothing built/linted/tested vscode-extension/ on PRs (every prior extension PR was only validated locally), and the extension was never packaged or published.

CI — vscode-extension-ci.yml

A path-filtered Node workflow (runs only when vscode-extension/** changes) that does npm ci → lint → compile → unit tests → a vsce package smoke test, and uploads the built .vsix as an artifact. Kept separate from the Python ci.yml so the toolchains don't mix.

Publish — vscode-extension-publish.yml

Manual (workflow_dispatch) publish that packages and publishes to:

• VS Code Marketplace — gated on the VSCE_PAT secret
• Open VSX — gated on the OVSX_PAT secret

Each publish step is skipped if its secret is absent (secrets are read at job level so the step if: guards actually work). A dry_run input packages without publishing. Manual (not release-triggered) so it isn't tied to the Python semantic-release cadence and can't double-publish an unchanged version.

Icon

icon.png (128×128) derived from the project logo — a rounded square with the brand blue/orange diagonal split and the two white dots from logo.svg. Generated by scripts/generate-icon.py using only the Python stdlib (no Pillow/cairosvg, since none are available), kept in-repo for reproducibility, and wired via the package.json icon field.

Packaging cleanup

.vscodeignore now excludes compiled tests (out/test/**) and scripts/; the packaged .vsix drops from 27 → 23 files (~41 KB).

Maintainer prerequisites (one-time, can't be automated here)

To actually publish, the repo owner needs to:

1. Create the platzhersh publisher on the VS Code Marketplace (and optionally Open VSX).
2. Add a VSCE_PAT secret (and optionally OVSX_PAT).
3. Bump version in vscode-extension/package.json, then run the publish workflow.

Verification

• Both workflow YAMLs parse cleanly; vsce package succeeds locally (23 files, 41 KB, icon included).
• Extension compile + lint + all 5 test suites pass (detector 21, autocomplete 35, templateTree 128, validation 33, opt 17).

Completes Phase 3D (Marketplace publication) from PRD-0015.

https://claude.ai/code/session_016Lgp3PJ5ebGMVzWiddxbA5

---

Generated by Claude Code

[coderabbitai]

Important

Review skipped

Draft detected.

Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 08eb5a03-d76e-433d-905f-815b4948c03f

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

Use the checkbox below for a quick retry:

• 🔍 Trigger review

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch claude/vscode-extension-ci-publish

---

_{Comment @coderabbitai help to get the list of available commands and usage tips.}