Introduce apply_io_year_adjustments bucket flag (IO year adjustments)

[briantobin-99]

cc:
Closes:

What changed? Why?

Introduces the "IO year adjustments" bucket flag:

• New apply_io_year_adjustments: ON = CEDA's A/q scaling to usa_io_data_year with the summary dollar-year rebase always applied, bedrock-derived industry inflation factors, and gross output at usa_ghg_data_year as B's denominator. OFF = the pre-v0.3 footing (legacy A tail, reference-data inflation factors, 2017 x in B).
• Absorbs and deletes scale_a_matrix_with_ceda_method_as_fallback, adjust_summary_A_and_q_dollar_year, and update_inflation_factors (no surviving config sets them separately).
• cornerstone_industry_avg_margins is deliberately not absorbed — margins remains a standalone flag.
• use_E_data_year_for_x_in_B survives as a compatibility flag for configs that use GHG-year x without the A/inflation adjustments (the electricity configs and USEEIO-parity footing). Readers use the composite cfg.use_ghg_year_x_in_B property (apply_io_year_adjustments or use_E_data_year_for_x_in_B), so those configs' behavior is unchanged.

Config migration: 2025_usa_cornerstone_v0_3.yaml and the waterfall g2/g3/final configs collapse the four flags into apply_io_year_adjustments: true; ceda-g1a/g1b carry the explicit false. The canonical v0.3 config is now ~6 effective lines.

Testing

Unit suite, black, ruff, and mypy green. The ON path is flag-for-flag identical to the v0.3 set; Snapshot integration suite (test_integration run) passes on the stack including this change.