chore: tighten VS Code extension package

[k08200]

Summary

• add the repository MIT license to the local Spock VS Code extension package
• declare the extension's shipped files explicitly
• keep development-only .vscode launch configuration and compiler corpus out of the installed VSIX

Why

The canonical TextMate grammar and compiler parity tests were already complete, but vsce package emitted packaging warnings and included development fixtures in the distributable archive.

This is limited to editors/vscode and does not change the Spock language, compiler, CLI, or runtime.

Validation

• cargo test --locked -p spock-lang — 124 tests passed
• cargo run --locked -q -p spock-cli -- check editors/vscode/test/corpus.spock — accepted
• npx --yes @vscode/vsce package --out /tmp/spock-textmate-loader-clean.vsix — packaged without warnings
• verified the VSIX contains only the manifest, README, license, language configuration, and TextMate grammar
• git diff --check

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