feat: align market-data breadth, limits, and replay contracts

[nuttykenzo]

Summary

• Adds typed HIP-3 breadth current and cursor-paginated history access, with explicit 2026-08-28 history availability and all six served downsampling intervals.
• Supports Hyperliquid core l4_diffs and l4_orders replay as an initial l4_snapshot followed by ordered l4_batch frames; HIP-3, HIP-4, and Spot L4 remain live-only.
• Corrects projected forced-liquidation price-level cadence to approximately five minutes and documents Lighter funding values as fractional and non-annualized.
• Preserves all six Lighter WebSocket channels as replay-only and retains the candidate's family-specific limit, cursor, HIP-4, Spot, and Lighter contract repairs.

Validation

• python3 -m pytest -q (46 passed)
• Focused breadth interval contract (6 passed) and full coverage/WebSocket suite (46 passed)
• Focused Ruff check passed
• Wheel and source distribution built successfully
• Clean wheel and source-distribution consumer imports passed
• git diff --check, compileall, exact-path validation, and stale 45-minute scan passed

Baseline notes

• Full-repository Ruff remains non-green only on inherited diagnostics outside this amendment; the focused changed-path lint gate is green.
• This repository has no hosted check-runs or required status contexts for the exact head.

No package was published, tagged, merged, or released.