[TexasCoding]

Closes #561

Reconciles Spec Drift run 40870823940 (core OpenAPI 3.35.0 + perps). Additive; bumps to 22.5.0 (also ships test-only #560).

Changes

• subaccount_type optional on MarginPosition, MarginSubaccountBalance, MarginRiskPosition, MarginFundingHistoryEntry (spec-required → server_omits_despite_required exclusions, like MarginMarket.halt_sources).
• New endpoints (sync + async, registered in METHOD_ENDPOINT_MAP / BODY_MODEL_MAP, tests added):
  • GET/PUT/DELETE /portfolio/positions/{ticker}/exit_trigger → portfolio.exit_triggers / set_exit_trigger / cancel_exit_trigger
  • GET /portfolio/credit_history → portfolio.credit_history / credit_history_all
  • POST /portfolio/events/orders/with_exit_trigger → orders.create_with_exit_trigger
  • GET /margin/markets/schedules → perps.markets.schedules
• Perps WS channel market_lifecycle_v2 → PerpsWebSocket.subscribe_market_lifecycle.
• Specs synced, kalshi/_generated regenerated (no hand edits).

Blast radius (manual; GitNexus unavailable)

• No existing public method, model field or signature removed or changed; diff outside _generated only adds code (checked for removed defs/classes/fields).
• New optional fields default to None, so older payloads still parse; model equality/serialization of existing callers gains one None key at most.
• PerpsChannel enum gains a member; exhaustive match users could see a new value.
• New write methods (PUT/DELETE/POST) are not retried.
• _generated regeneration only affects internal contract tests.

Gates

• ruff: pass · mypy: pass (161 files)
• pytest unit: 5046 passed, 3 skipped
• strict contracts (-W error::UserWarning): 930 passed