CI: build Neva LSP binaries and package VSIX

[emil14]

Summary\n- add GitHub Actions CI workflow to build all required binaries from (darwin/linux/windows x amd64/arm64)\n- upload each built binary as an artifact and then assemble them into for extension packaging\n- build and package the extension (

added 567 packages, and audited 568 packages in 16s

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34 vulnerabilities (2 low, 14 moderate, 11 high, 7 critical)

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npm audit fix

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npm audit fix --force

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vscode-nevalang@0.7.6 build
npm-run-all build:*

vscode-nevalang@0.7.6 build:ts
tsc --noEmit && node esbuild.js --production

[watch] build started
[watch] build finished

vscode-nevalang@0.7.6 build:syntax
js-yaml syntaxes/neva.tmLanguage.yml > syntaxes/neva.tmLanguage.json, DONE Packaged: /Users/emil/.codex/worktrees/f122/vscode-neva/vscode-nevalang-0.7.6.vsix (18 files, 359.42KB)) and upload as CI artifact\n- document CI behavior in CONTRIBUTING: no git submodule required for LSP\n\n## Why\nThis makes extension CI/CD self-contained: it can build the exact LSP binaries needed for release packaging without relying on manual local copying into .\n\n## Notes\n- workflow supports manual dispatch with optional input to build against a specific branch/tag/SHA\n- no version bump or publishing changes included\n\n## Verification\n- local:
vscode-nevalang@0.7.6 build
npm-run-all build:*

vscode-nevalang@0.7.6 build:ts
tsc --noEmit && node esbuild.js --production

[watch] build started
[watch] build finished

vscode-nevalang@0.7.6 build:syntax
js-yaml syntaxes/neva.tmLanguage.yml > syntaxes/neva.tmLanguage.json passes\n

[emil14]

Superseded by #22 (same changes with CI fixes and green checks).