* fix(core): map GPT-5.6 to the official 1.05M context window
LiteLLM fallback treated Sol, Terra, Luna, and the gpt-5.6 alias as unknown and used the 8k default.
* fix(openai): give GPT-5.6 its own 1.05M window
Native lookup matched gpt-5 first, so Sol, Terra, and Luna inherited 1,047,576. Longest-prefix matching keeps gpt-5 and gpt-5.4-mini on their own sizes.
* fix(azure): map GPT-5.6 deployments to the official 1.05M window
Azure had no gpt-5 / gpt-5.6 entry, so Sol, Terra, and Luna fell back to 8k.
* feat(cli): list GPT-5.6 Sol, Terra, and Luna in curated catalogs
The family is generally available; keep gpt-5.5 as the offline default.
* refactor: keep context-window tables in longest-prefix order
Drop the runtime sort and document that new keys must be inserted longest-first so startswith matching stays correct.
* fix(core): resolve prefixed LiteLLM models to the GPT-5.6 window
openai/gpt-5.6-luna kept its provider prefix on self.model, so startswith matching missed the 1.05M mapping. Strip recognized prefixes for lookup and leave unknown ones intact.
