Reuse the xhigh opt-out policy for OpenAI-compatible `max` normalization: non-Claude
providers map `max` to `xhigh` unless the target model explicitly opts out (DeepSeek
via OpenRouter supports xhigh), downgrading to `high` only on explicit opt-outs.
Resolves common Claude aliases (anthropic/claude-opus-4.6, anthropic.claude-opus-4-6,
short/dated/-thinking variants) back to the canonical Claude xhigh-support list, and
keeps literal `max` pass-through for native Claude/CC providers that support it. Also
moves the mistral/github reasoning-effort rejection ahead of normalization (it was
previously dead code for `max`). Includes the v3.8.25 release file-size re-baseline.
Integrated into release/v3.8.25.
Co-authored-by: R.D. <rogerproself@gmail.com>
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