Wire generateApiSurface into each config's build:done (with a shared
counter so it runs once after all parallel builds). Add scripts/
generate-api-surface.js (strip regions, sourceMappingURL, optional JSDoc;
keep @deprecated blocks).

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Snapshots from built .d.mts (baseline before coupling/deprecation work).

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…ator)

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- sv-utils: add loadFile, saveFile, loadPackageJson; deprecate readFile,
  writeFile, getPackageJson; remove installPackages (logic lives in sv engine).
- sv: inline updatePackages in engine; use new helpers; drop deprecated
  workspace.file paths; addons use string literals; remove stale @deprecated
  on processors/create exports.
- Regenerate api-surface snapshots.

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…son aliases

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…e eslint.config.js path

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YamlDocument.get returns unknown; assert minimal shape before reading .items
so tsgo check passes.

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