Fusion's plugin loader imports source files directly via Node 22 ESM
without a TS loader, so relative imports like "./internal/dedup.js"
fail at runtime: there's no compiled .js artifact and Node won't fall
back to .ts. Inline severity classifier, dedup cache, rate limiter,
and Grafana parser into the single entry file. Tests now import named
exports from "../index.js" directly. The Phase-2 split into separate
source files can come back once fusion adds a TS-aware plugin loader.
All 14 unit tests still pass. Behavior unchanged.
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