[fabiofranzini]

Summary

Importing a small root export previously retained unrelated PnP registrations and inflated consumer bundles. Add canonical domain/narrow entrypoints and keep registration effects in the four feature-owning PnP services. Root, domain and preserved legacy leaf imports now produce identical production bundle sizes across nine fixture families.

• Preserve all 599 historical packed paths, declaration contracts, dependency/peer ownership and provider isolation; add the styles facade and exact export/type resolution contracts.
• Make standalone list services register their required webs feature. Direct PnP consumers must explicitly import the features they use instead of relying on incidental root registration. Release/version assessment is required before publication.
• Add installed-tarball bundle, runtime and mutation gates to CI, plus public import/migration documentation and an interactive Imports sample.

Validation

Fresh local checks before this PR:

• npm run build (library before app), npm run verify, npm run verify:package, and git diff --check.
• 676 tests; 36 production bundle variants, 18 fresh runtime probes and nine intentional mutations.
• All 18 blocking root/domain-versus-leaf gzip gaps are zero, with zero forbidden emitted modules. Minimum useSx root fixture falls from 24,087 to 11,986 gzip bytes; its extra size versus direct Griffel is 1,971 gzip bytes.
• Actual ImportsPanel Chrome QA: 65 observations without failures, including mixed imports, current captured callbacks, style overrides, LTR/RTL and mobile keyboard scrolling. The user also confirmed the web part works correctly.

Authenticated tenant checklist details and the full peer/browser matrix were not independently executed. Existing npm/SPFx metadata advisories remain visible. See .docs/maintenance/2026-10-07-granular-tree-shaking-verification.md for measurements, provenance and evidence.

Scrollbar follow-up

scrollbar.fluent now uses 6px on both axes with 3px rounded thumb corners in Edge/Chrome, with Fluent colors, transparent tracks and native forced-colors fallback. Foreign Griffel width/color overrides keep their original composition precedence.

Fresh verification passes: 676 tests, complete 36/18/9 package gates, and 477 sample + 967 engine observations in each of Edge154 and Chrome155. Both actual gutter dimensions are6px; computed thumb radius is3px. See .docs/maintenance/2026-10-07-scrollbar-axes-fix.md.

Scrollbar interaction restoration

Restored Fluent hover and pressed/dragged thumb colors, including pressed priority, release and mouse-leave feedback. Width/height remain6px and corners3px. Actual Edge/Chrome pointer tests and168 screenshot pixel checks pass in light, dark and high-contrast palettes;676 tests and all package gates pass. See .docs/maintenance/2026-10-07-scrollbar-hover-fix.md.

Actual SharePoint host theme correction

The real workbench host theme flattened base/hover/pressed scrollbar colors to the same v8 neutralSecondary token. Preserve the migration output except its two state tokens: map hover/pressed to host neutralPrimary/neutralDark. Real converter and host-provider regression tests now cover this path.

Verified in the user's authenticated Edge workbench after restarting the dev server: base#605e5c → hover#323130, pressed token#201f1e, still6px/radius3px. Actual native-window pixel checks confirm the hover change.676 tests and full package gates pass; no tenant writes or broad host-permission claims.