feat(vscode): add thin language client extension

[Seddryck]

Summary

• register .expressif files with the Expressif language identifier
• launch a bundled self-contained Expressif.LanguageServer over standard LSP stdio transport
• expose server stderr and language-client tracing through the VS Code Output view
• add F5 development tasks, platform-specific server publishing, VSIX packaging, and local installation documentation

All parsing and language intelligence remain in the protocol-independent server and Expressif.Syntax; the extension contains only editor integration and process-launching behavior.

Validation

• npm run check
• npm run compile
• npm run package (generated a 45.01 MB win-x64 VSIX with the bundled server)
• npm audit (0 vulnerabilities)
• dotnet test src/Expressif.LanguageServer.Core.Tests/Expressif.LanguageServer.Core.Tests.csproj --configuration Release --framework net10.0 --runtime win-x64 --nologo -p:TargetFrameworks=net10.0 (10 passed)
• git diff --check

Local CLI installation could not be exercised in this environment because the code command is not installed; packaging and VSIX content inspection succeeded.

Closes #13

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: d1fd658c-f6c9-4235-90f4-3b579ccfdc23

📥 Commits

Reviewing files that changed from the base of the PR and between 61cb23e and 2b21b89.

⛔ Files ignored due to path filters (1)

• vscode-extension/package-lock.json is excluded by !**/package-lock.json

📒 Files selected for processing (12)

• .gitignore
• .vscode/launch.json
• .vscode/tasks.json
• vscode-extension/.gitignore
• vscode-extension/CHANGELOG.md
• vscode-extension/LICENSE
• vscode-extension/README.md
• vscode-extension/language-configuration.json
• vscode-extension/package.json
• vscode-extension/scripts/publish-server.mjs
• vscode-extension/src/extension.ts
• vscode-extension/tsconfig.json

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