Both ternary branches in planShardAssignments() omitted weight from the
pushed entry objects despite using entry.weight for bin-packing. Downstream
consumers that relied on shard entry weight (e.g., balance verification)
had to reconstruct it from computeSplitPlan output.
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
Merges FN-3470 in two steps: first, runtime plugins now prefer source path aliases over build artifacts, with hardening tests for vitest alias resolution and plugin view registry updates; second, a new `ensure-test-artifacts.mjs` bootstrap script guarantees required test files exist before test runs
Fusion-Task-Id: FN-3470
