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gsxdsm b663eebcb3 FN-7035: split oversized test suites

Split oversized ChatView and notifier suites while updating the line-count baseline.

- Move ChatView core contract and interaction coverage into focused sibling test files.
- Move notifier runtime coverage into its own suite and share setup through a test harness.
- Document the line-count guard decision and ratchet baseline entries for existing growth.

Files changed:
 .../__tests__/ChatView.core-contracts.test.tsx     |  623 ++++++++
 .../__tests__/ChatView.core-interactions.test.tsx  | 1261 +++++++++++++++
 .../components/__tests__/ChatView.core.test.tsx    | 1652 +-------------------
 .../engine/src/__tests__/notifier.runtime.test.ts  |  810 ++++++++++
 .../engine/src/__tests__/notifier.test-harness.ts  |   71 +
 packages/engine/src/__tests__/notifier.test.ts     |  847 +---------
 scripts/check-file-line-count.mjs                  |    3 +
 scripts/line-count-baseline.json                   |   12 +-
 8 files changed, 2778 insertions(+), 2501 deletions(-)

Fusion-Task-Id: FN-7035
Fusion-Task-Lineage: 14cebb57-925b-41c7-9c8b-472f34b76fe2

2026-06-25 20:50:30 -07:00