dcdpr / jp / 26683818862

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feat(config, llm): Support chained model aliases (#705)

Model aliases in `providers.llm.aliases` can now point to other aliases
rather than only to concrete model IDs. The resolver follows the chain
to a concrete `provider/name` model, and detects cycles, surfacing a
clear error during config load.

Before this change, each alias value had to be a full model ID. With
chained aliases you can now write:

```toml
[providers.llm.aliases]
opus  = "anthropic/claude-opus-4.8"
coder = "opus"
```

Both `coder` and `opus` resolve to `anthropic/claude-opus-4.8`.

The entire alias map is validated up front in `resolve_aliases`, so a
cycle between two aliases that no field references still causes a hard
error at startup rather than being silently ignored. The error message
names every hop in the chain:

  providers.llm.aliases: model alias cycle detected: a -> b -> a

Signed-off-by: Jean Mertz <git@jeanmertz.com>

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