- Deleted the id(cfg)-keyed _OVERRIDE_CACHE layer: id() is unique only
among live objects, so a config reload could serve stale overrides
forever when CPython reuses the freed dict's address. The upstream
load_config_readonly is already (mtime,size)-cached (~1 stat/hit), so
the local layer was redundant state with a correctness risk.
- _override_to_catalog_shape returns (patch, vision) instead of
smuggling an in-band _vision_override sentinel key through the merged
dict; removed the two dead call-site pops.
- _find_model_entry gains the :cloud/-cloud suffix fallback that
lookup_models_dev_context already had, so 'catalog hit' means the
same thing to every consumer — a suffix-keyed model (kimi-k2.6:cloud)
now counts as KNOWN and keeps its catalog capabilities instead of
being displaced by a fill-gap _default (mutation-checked contract
test added).
- get_model_info's unknown-model override path seeds the same safe
defaults as get_model_capabilities (200K ctx, tools on, 8192 out),
so a partial override no longer yields ctx=0/tools-off on that path
(contract test added); the DEFAULT_CONFIG defaults claim is now true
for both paths.
- Activated the previously-dead _MODELS_DEV_TO_PROVIDER reverse map
(lazily built, many-to-one aware) and used it in
_provider_override_section instead of a per-call linear scan.
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