[FEATURE]: Allow 1M context window for GPT 5.6

#24212 made the default for 5.5 models (and now 5.6) to context: 400_000

Tibo has added 1M context window support for 5.6 models here: https://x.com/thsottiaux/status/2089082893804896524

model = "gpt-5.6-sol"
model_context_window = 1000000
model_auto_compact_token_limit = 900000

I would like a similar setting for opencode as well.

This issue might be a duplicate of existing issues. Please check:

[FEATURE]:Support full 1M context windows for models that officially provide it #39658: Feature request to support full 1M context windows for models that officially provide it (same general ask)
[FEATURE]:Allow configurable context window instead of hard‑coded value for individual models #40818: Allow configurable context window instead of hard-coded value for individual models (related: per-model context window config)

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