## What
Adds a 245-node workflow asset and two `@perf` tests to establish a
baseline for large-graph performance regressions (Tier 6 in the
performance backlog).
## Why
Backlog item N5: we need CI regression detection for compositor layer
management, GPU texture count, and transform pane cost at 245+ nodes.
This is PR1 of 2 — establishes baseline metrics on main. Future
optimization PRs will show improvement deltas against this baseline.
## Tests Added
- **`large graph idle rendering`** — 120 frames idle with 245 nodes,
measures style recalcs, layouts, task duration, heap delta
- **`large graph pan interaction`** — middle-click pan across 245 nodes,
stresses compositor layer management and transform recalculation
## Workflow Asset
`browser_tests/assets/large-graph-workflow.json` — 245 nodes (49
pipelines of CheckpointLoader → 2× CLIPTextEncode → KSampler +
EmptyLatentImage), 294 links. Minimal structure focused on node count.
## Verification
- [x] `pnpm typecheck:browser` passes
- [x] `pnpm lint` passes (eslint on changed file)
- [x] All link references in JSON validated programmatically
┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-9940-test-add-large-graph-perf-test-with-245-node-workflow-backlog-N5-3246d73d365081f6b5d8ddb9a85e6ad0)
by [Unito](https://www.unito.io)
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Co-authored-by: GitHub Action <action@github.com>
