Summary

Closes #192

This completes the stable Inertia v3 support lane for inertia-sails and the Boring Stack templates, including the follow-up protocol metadata work for preserved fragments and rescuable deferred props.

Companion docs: sailscastshq/docs.sailscasts.com#71

What Changed

• Updated template root views to use the Inertia v3 JSON script boot payload.
• Added asset-version mismatch handling for GET Inertia requests using 409 Conflict and X-Inertia-Location.
• Changed Inertia JSON responses to use Vary: X-Inertia.
• Omitted false clearHistory, encryptHistory, and preserveFragment flags from page objects.
• Added sharedProps metadata.
• Added sails.inertia.preserveFragment() and session-backed consumption across redirects.
• Added deferred prop rescue support via .rescue() / { rescue: true } and rescuedProps metadata.
• Omitted merge/scroll metadata for rescued props so the client never receives merge hints for missing data.
• Added v3 merge metadata support: mergeProps, prependProps, deepMergeProps, and matchPropsOn.
• Added nested append/prepend merge targets and item matching.
• Added InfiniteScroll merge intent support with X-Inertia-Infinite-Scroll-Merge-Intent.
• Strengthened JSDoc types across inertia-sails, removed a // @ts-nocheck, and added a CI-enforced check:js gate.
• Added focused Node test coverage for page objects, render behavior, merge props, scroll props, preserve fragments, and rescued deferred props.
• Refreshed all template lockfiles against the published inertia-sails@1.4.0 npm tarball.

Validation

• npm view inertia-sails@1.4.0 version dist.tarball dist.integrity gitHead
• Verified all template lockfiles resolve inertia-sails@1.4.0 to the published npm integrity.
• npm --workspace inertia-sails run check:js
• npm --workspace inertia-sails test
• npx prettier --config ./.prettierrc.js --check packages/inertia-sails/index.js packages/inertia-sails/test.js packages/inertia-sails/lib/**/*.js packages/inertia-sails/tests/**/*.js
• npx prettier --config ./.prettierrc.js --check templates/ascent-react/package-lock.json templates/ascent-vue/package-lock.json templates/mellow-react/package-lock.json templates/mellow-svelte/package-lock.json templates/mellow-vue/package-lock.json
• git diff --check

Notes

The root jsconfig.json already enables checkJs for editor feedback. This PR adds the repeatable package-level command and GitHub Actions workflow so the same feedback is enforced outside VS Code too.

inertia-sails@1.4.0 is now published to npm, and the template lockfiles have been refreshed to the published tarball integrity.