Stabilized the ResearchView layout by refactoring CSS and component structure, with 175 lines of fixes spanning the CSS module, component TSX, and new regression tests. Also includes a patch changeset for the release note.
Fusion-Task-Id: FN-4134
Fusion-Task-Lineage: ca3ad67b-766b-4da6-be7f-c3927d718acd
Implements weighted shard planning for the CI test sharding script, with deterministic test coverage and documentation updates to `contributing.md`.
Fusion-Task-Id: FN-4043
- Expand test-changed coverage and shard selection assertions for CI workflows
- Improve vitest worker temp-directory utilities and related core/CLI tests
- Refine test isolation guardrails and runtime ignore handling for live .fusion noise
- Update contributing guidance and root test script usage for the verified workflow
Fusion-Task-Id: FN-3607
This merge refactors the test-changed script and adds new CLI tests (FN-3234), keeping automation on the full-suite path. It includes a new test file for the root test command, updates to the CI workflow, and documentation improvements.
Fusion-Task-Id: FN-3234
