fix(prism): stop advertising observed tokens as recipe budget

[echobt]

Summary

• GET /v1/site/arenas/prism/window was publishing tokenBudget as the max observed telemetry x (~2.6B from leader run 404b3d00), which the site labeled as an egalitarian single-pass window.
• Recipe 1.2.0 does not publish a fixed token quota — caps are wall-clock / steps / params + pinned shard. tokenBudget is now 0; chart series still carry observed-token x for plotting.
• Miner-facing docs clarify train_rows: 2048 (baseline cut ≈2M GPT-2 tokens) vs full-shard streaming under the 6h cap.

Audit notes (no scoring change)

• Prod still runs recipe 1.2.0 / pin_hex=cba5280… (not prism-better 1.3+/v3).
• Harness METRICS_JSON.tokens_seen still echoes TRAIN_ROWS (2048) — flagged as follow-up (changes recipe pin).

Test plan

• cargo test -p site-data -p site-api --lib prism_window
• After deploy: GET /v1/site/arenas/prism/window → tokenBudget: 0, series still plot
• Confirm design gallery paths untouched

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 758a51fa-6931-4277-a13b-d78c4ff2fbed

📥 Commits

Reviewing files that changed from the base of the PR and between 6e159e2 and 5b98a59.

📒 Files selected for processing (6)

• crates/site-api/src/handlers.rs
• crates/site-data/src/map.rs
• crates/site-types/src/types.rs
• docs/PRISM_RECIPE.md
• docs/SITE_API.md
• docs/external-miner/prism.md

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