[rafaelha]

Bumps the extension to 0.2.0 and adds the changelog entry.

What's new

• Tsim files. .tsim files share the Stim language mode, highlighting, editor features, and visualizer.
• All Tsim gates in visualization. T, T_DAG, TPP, TPP_DAG, R_X, R_Y, R_Z, R_XX, R_YY, R_ZZ, R_PAULI, U3, CCZ, and CCX are drawn as real gates, with their rotation angles and controlled-gate connections, in the 2D timeline, time slice, and 3D timeline views.
• Editor support for the new gates. Autocomplete, hover documentation, and signature help cover the non-Clifford gates and aliases such as R_PAULI and U.
• Older tagged circuits still work. Circuits that encode Tsim gates in Stim tags (for example S[T] or I[R_X(theta=0.25*pi)]) render as the matching gates, and detector slices and match graphs keep showing them as their Clifford stand-ins.
• New VS Code setting stim.svgZoomMode. Set it to scroll to zoom SVG views with plain scrolling instead of Ctrl/Cmd+scroll. Changes apply to open viewers immediately.
• Viewer fixes. Slice navigation no longer lands on empty trailing layers (including after REPEAT blocks), and a slow render can no longer replace a newer diagram or error.

Checks

• Type-check, build, engine tests (25) and grammar tests pass.
• vsce package produces a 23-entry VSIX containing only runtime files: the manifest, package.json, the grammars and language configuration, the webview assets, the bundled dist/extension.js, the WebAssembly engine, the icons, the README, the changelog, and the license/NOTICE files. Nothing from src/, test/, third_party/, node_modules/, .ui-tests/, or the screenshots.

After merging

Tag the merge commit v0.2.0 and push the tag to run the release workflow (see .github/RELEASING.md).

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