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docs/implplan/SPRINT_0512_0001_0001_bench.md

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+# Sprint 0512 · Ops & Offline · Bench (190.G)
+
+## Topic & Scope
+- Build and capture performance benchmarks for graph, UI interactions, impact index, policy deltas, and reachability scoring to support offline/ops readiness.
+- Target harnesses under `src/Bench/StellaOps.Bench` with reproducible datasets.
+- **Working directory:** `src/Bench/StellaOps.Bench`.
+
+## Dependencies & Concurrency
+- Upstream data: graph fixtures (SAMPLES-GRAPH-24-003), reachability schema (Sprint 0400/0401), policy delta inputs.
+- UI bench depends on BENCH-GRAPH-21-001/002 harness foundation.
+
+## Documentation Prerequisites
+- docs/07_HIGH_LEVEL_ARCHITECTURE.md
+- docs/modules/platform/architecture-overview.md
+- docs/modules/graph/architecture.md (for graph bench scenarios)
+- docs/modules/signals/architecture.md (for reachability benches)
+- docs/modules/policy/architecture.md
+
+## Delivery Tracker
+| # | Task ID | Status | Key dependency / next step | Owners | Task Definition |
+| --- | --- | --- | --- | --- | --- |
+| 1 | BENCH-GRAPH-21-001 | BLOCKED | Need graph bench harness scaffolding (50k/100k nodes) | Bench Guild · Graph Platform Guild | Build graph viewport/path benchmark harness (50k/100k nodes) measuring Graph API/Indexer latency, memory, and tile cache hit rates. |
+| 2 | BENCH-GRAPH-21-002 | BLOCKED | Blocked on 21-001 harness | Bench Guild · UI Guild | Add headless UI load benchmark (Playwright) for graph canvas interactions to track render times and FPS budgets. |
+| 3 | BENCH-GRAPH-24-002 | BLOCKED | Waiting for 50k/100k graph fixture (SAMPLES-GRAPH-24-003) | Bench Guild · UI Guild | Implement UI interaction benchmarks (filter/zoom/table operations) citing p95 latency; integrate with perf dashboards. |
+| 4 | BENCH-IMPACT-16-001 | BLOCKED | Impact index dataset/replay inputs not provided | Bench Guild · Scheduler Team | ImpactIndex throughput bench (resolve 10k productKeys) + RAM profile. |
+| 5 | BENCH-POLICY-20-002 | BLOCKED | Policy delta sample inputs missing | Bench Guild · Policy Guild · Scheduler Guild | Add incremental run benchmark measuring delta evaluation vs full; capture SLA compliance. |
+| 6 | BENCH-SIG-26-001 | BLOCKED | Reachability schema/fixtures pending Sprint 0400/0401 | Bench Guild · Signals Guild | Develop benchmark for reachability scoring pipeline (facts/sec, latency, memory) using synthetic callgraphs/runtime batches. |
+| 7 | BENCH-SIG-26-002 | BLOCKED | Blocked on 26-001 outputs | Bench Guild · Policy Guild | Measure policy evaluation overhead with reachability cache hot/cold; ensure ≤8 ms p95 added latency. |
+
+## Execution Log
+| Date (UTC) | Update | Owner |
+| --- | --- | --- |
+| 2025-11-18 | Marked BENCH-GRAPH-24-002, BENCH-IMPACT-16-001, BENCH-POLICY-20-002, BENCH-SIG-26-001/002 as BLOCKED pending fixtures/datasets and reachability schema. | Bench |
+| 2025-11-18 | Normalised sprint to standard template; renamed from SPRINT_512_bench.md. | Ops/Docs |
+
+## Decisions & Risks
+- Graph/UI benches depend on large fixtures (SAMPLES-GRAPH-24-003) and graph overlay schema; risk until fixtures land.
+- Reachability benches depend on runtime/static schema alignment (Sprint 0400/0401) and fixture relocation.
+- Policy/Impact benches require deterministic datasets; ensure no online dependencies.
+
+## Next Checkpoints
+- 2025-11-22 · Confirm availability of graph fixtures for BENCH-GRAPH-21-001/002/24-002. Owner: Bench Guild.
+- 2025-11-24 · Reachability schema alignment outcome to unblock BENCH-SIG-26-001. Owner: Signals Guild.
+- 2025-11-26 · Decide impact index dataset for BENCH-IMPACT-16-001. Owner: Scheduler Team.