feat: update VS Code preview to released editor RC2

[AlexMikhalev]

This updates the existing VS Code preview to 0.1.1 and bundles the published editor v0.1.0-rc.2. The importer verifies the release source commit and, when present, its public repository and Cargo.lock checksum before writing assets. Historical RC1 manifests remain supported.

The GitHub VSIX release can complete while marketplace account setup is pending. After package qualification and GitHub download verification, an explicit planner schedules only marketplace targets whose readiness variable is exactly true; unset or false records NOT_PUBLISHED. Invalid values refuse all marketplace attempts. Existing protected environments, federated authentication and registry readback remain required; there is no automatic PAT fallback.

Validation:

• Independently downloaded and hash-checked the published RC2 archive, manifest and separate source-pinned host bridge; verified all 133 imported assets.
• Compile and ESLint pass; 49 Python, 16 actual WASM host, nine graph/export and four legacy WASM tests pass. Eight planner tests exercise subprocess outputs, disabled/malformed gates and workflow boundaries.
• Built and verified a local candidate VSIX. In a disposable VS Code 1.126.0 profile it saved actual Risk/Concern annotations and exported both names with the same graph ID. That local attempt failed its window-focus guard before undo/redo; it does not qualify native history. The existing Linux/macOS/Windows CI package checks remain required.
• Actionlint, diff checks and 60 release-recovery contract tests pass. UBS found no critical findings; six heuristic warnings were reviewed.
• Parent and independent scoped reviews found no blocking issues in the importer or readiness gates.

The published 0.1.0 package remains unchanged. No marketplace readiness variables or access permissions are changed, and this PR makes no claim that either marketplace has published 0.1.1 or that all 41 original visual requirements are qualified.