Handle missing TQQQ account hash metadata

[Pigbibi]

Summary

• make the TQQQ growth-income plan tolerate portfolio snapshots without Schwab-style account_hash metadata
• keep account_hash populated when present, and use None when the platform does not provide it
• add regression coverage for IBKR-style portfolio metadata that only includes account_ids

Verification

• python3 -m unittest tests.test_strategy_plans.StrategyPlanMetadataTest.test_tqqq_growth_income_exposes_live_dual_drive_metadata tests.test_strategy_plans.StrategyPlanMetadataTest.test_tqqq_growth_income_accepts_portfolio_without_account_hash -v (skipped locally because numpy is not installed)
• python3 -m py_compile src/us_equity_strategies/strategies/tqqq_growth_income.py tests/test_strategy_plans.py
• git diff --check

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Preserve account_hash from any Mapping metadata

The new extraction only reads account_hash when snapshot.metadata is a concrete dict, so snapshots that provide metadata as another Mapping type (e.g., MappingProxyType or custom mapping wrappers) will now silently lose account_hash even when the key is present. This is a regression from the prior snapshot.metadata["account_hash"] behavior and can break downstream execution metadata routing for environments that pass non-dict mappings; elsewhere in this repo metadata is normalized via isinstance(..., Mapping) (for example _metadata_mapping in entrypoints/_portfolio_dashboard.py), so this narrower type check is inconsistent.

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