Put uncertainty and budget roles on remaining figures

[esaran1]

Why

Ranking figures now can hold out --intermediate-budget, but the regret-vs-exploration curve still uses a single gate bootstrap stream (rng=123) and no error bars. Class crossover frequency is a normalized pair-participation rate, not a claim about a population of classes. Ensemble-disagreement figures exist; they still need the same budget-role contract as the audit.

What to do

1. Pass the same --budgets / --intermediate-budget / --fit-form as the audit.
2. Add interval or replicate bands to regret-vs-exploration, or label it as a diagnostic sweep rather than a paper figure.
3. Write figure_metadata.json next to every PNG/PDF (CLI already started this).
4. If Chinchilla figures cannot support the gate curve, skip and log that; do not draw a compute-power-law substitute.

Acceptance

• Paper figures cite the same input SHA-256 as results/audit.json
• Intermediate budget cannot leak into projection ranking plots
• Any figure without uncertainty is explicitly labeled diagnostic

Files

• asla/figures.py
• asla/cli.py
• tests/test_figures.py

Do not fabricate

• Fill missing crossover roots with placeholder vertical lines