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gsxdsm 746d33e7e6 FN-8468: prevent duplicate plugin startup loads

Ensure plugins share one process-wide startup lifecycle.

- Coalesce concurrent host and engine plugin loads into a single onLoad invocation.
- Synchronize reload and stop operations across participating loaders.
- Add regression coverage and document single-load lifecycle behavior.

Files changed:
 .changeset/fn-8468-plugin-single-onload.md         |   7 +
 docs/PLUGIN_AUTHORING.md                           |   1 +
 .../__tests__/plugin-loader-single-load.test.ts    | 126 +++++++++++++
 packages/core/src/plugin-loader.ts                 | 194 +++++++++++++++++++--
 .../__tests__/plugin-startup-single-load.test.ts   |  59 +++++++
 5 files changed, 370 insertions(+), 17 deletions(-)

Fusion-Task-Id: FN-8468

Fusion-Task-Lineage: a211f445-d236-44de-837b-28b9e15c7c52

Co-authored-by: Fusion (runfusion.ai) <noreply@runfusion.ai>

2026-07-21 19:28:35 -07:00