[codex] Prepare benchmark leaderboard implementation plan

ai/research/hillerfit-benchmark-leaderboard/README.md

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+# Generic Benchmark Leaderboard Implementation Packet
+
+This packet turns the benchmark leaderboard guide into implementation-ready contracts.
+
+Source narrative: [`../hillerfit-benchmark-leaderboard-guide.md`](../hillerfit-benchmark-leaderboard-guide.md).
+
+## Artifact Map
+
+| Artifact | Purpose |
+| --- | --- |
+| [`requirements.md`](requirements.md) | Product requirements, fixed assumptions, external gates, and v1/v2 scope. |
+| [`technical-design.md`](technical-design.md) | Components, data model, dependencies, write/read flows, and failure behavior. |
+| [`tasks.md`](tasks.md) | Ordered implementation tasks with acceptance criteria and explicit dependencies. |
+| [`test-strategy.md`](test-strategy.md) | Unit, integration, route, migration, LAT, and manual verification coverage. |
+| [`traceability.md`](traceability.md) | Matrix linking guide sections to requirements, design, tasks, and tests. |
+| [`assumptions-and-decisions.md`](assumptions-and-decisions.md) | Accepted decisions, deferred decisions, rejected alternatives, and the remaining user gate. |
+| [`reviewer-alignment.md`](reviewer-alignment.md) | Independent reviewer summaries and convergence notes. |
+
+## Build Rule: Source Data, Not Branded UI
+
+The supplied training PDF is a benchmark seed-data source only. "HillerFit" is allowed as provenance in research notes, seed receipts, and extraction metadata, but it is not a customer-facing product surface. Do not build any HillerFit-branded page, route, tab, product navigation item, marketing copy, logo, call to action, theme treatment, or other branded UI; the shipped UI remains WODsmith's generic benchmark board/stat-line experience.
+
+Non-goal: no HillerFit-branded pages, routes, tabs, navigation, stats pages, marketing surfaces, logos, calls to action, theme treatments, or customer-facing product areas.
+
+Do not fork product behavior without an owner decision. In particular, do not switch v1 back to all-time history, Men/Women divisions, `competitionType: "online"`, publish-gated benchmark results, branded UI, or baked-constant Weighted C2B unless the decision sheet is updated first.