[cesarenaldi]

Add optional trading.taker_delay_ms from the takerDelayMs response field, representing the taker delay in milliseconds. Deprecate trading.seconds_delay with guidance to use the new field.

Keep seconds_delay typed as int | None. Add regression coverage for parsing the new field, preserving the old field, and the deprecation warning.

Validation: Ruff lint and format checks, Pyright, uv build, and all 3,520 non-integration tests pass. The full test suite ran outside the sandbox to allow network and local WebSocket access.

Context: https://polymarket.slack.com/archives/C0CC6E66P0F/p1793265583940099

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Note

Low Risk
Additive model and parsing changes with backward-compatible deprecation; no trading or auth logic touched.

Overview
Adds trading.taker_delay_ms on the gamma Market model, mapped from the API’s takerDelayMs field (including flat payload normalization in parse_response).

trading.seconds_delay remains available but is marked deprecated with guidance to use taker_delay_ms instead; accessing it emits a Pydantic deprecation warning. The new field is not backfilled from secondsDelay when takerDelayMs is absent.

Unit tests cover parsing taker_delay_ms (including 0 and None), coexistence with secondsDelay, and the deprecation warning on seconds_delay.

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