Extrema Infra 0.3.1

Extrema Infra 0.3.1

This release adds channel-aware WebSocket decoding for Binance, Gate,
Hyperliquid, and OKX, reducing hot-path decode work while preserving
compatibility for control, error, and unexpected exchange frames.

WebSocket decoding

• Selects a preferred typed decoder from the configured WebSocket channel.
• Decodes normal high-frequency data frames without first traversing the
  broader exchange envelope.
• Retains the existing full-envelope decoder as the fallback for subscription
  responses, control messages, exchange errors, and unexpected frames.
• Emits a trace event when preferred decoding falls back.
• Keeps existing IntoWsData normalization, symbol conversion, order-state
  mapping, subscription behavior, and downstream event routing unchanged.

Documentation

• Clarifies the HList static-dispatch boundary and startup-bound task routing.
• Separates normalized exchange data handling from static strategy dispatch.
• Simplifies the scheduler-only strategy example.
• Restores the architecture diagram layout under Mermaid 11.16 and labels the
  Python model path as PyTorch.

Validation

• cargo fmt --all -- --check, locked checks, tests, strict Clippy, rustdoc,
  dependency checks, and package dry-run passed in CI.
• 147 LOB-client library tests passed with zero failures.
• Fixtures cover data, control, error, and fallback paths across Binance,
  Gate, Hyperliquid, and OKX.
• Focused release-mode decoder comparisons reduced selected Gate fixture decode
  time by 41.2%-45.6% and selected Hyperliquid fixture decode time by
  57.2%-60.6%.
• Concurrent cross-framework validation completed 84 formal measurements with
  zero drops, duplicates, missing routes, delivery loss, broadcast lag, or
  ending in-flight work.

Packaging

• Bumps the crate version to 0.3.1.
• Publish verification passed with 250 packaged files, about 2.3 MiB unpacked
  and 1.5 MiB compressed.
• cargo publish completed successfully for extrema_infra v0.3.1.

Merged changes

• #91 docs: simplify README runtime guidance
• #92 perf(ws): add channel-aware decoders with envelope fallback
• #93 chore(release): prepare v0.3.1