Fixes#3202.
Add first-party Z.ai, StepFun, and MiniMax rows to the shared model registry so provider-filtered list/resolve does not fall through to OpenRouter or DeepSeek defaults.
Teach the dispatcher model helper to honor top-level --provider as a fallback when the subcommand does not provide one, matching user-facing command intent.
Route explicit exec models through authenticated inventory when the configured route is unique, and fail early with a provider hint when the model alias is available from multiple configured providers.
Verification: cargo fmt --all --check; git diff --check; cargo test -p codewhale-agent -p codewhale-cli --locked; cargo test -p codewhale-tui explicit_exec_model --locked; cargo build -p codewhale-cli -p codewhale-tui --locked; debug model list/resolve smoke; debug Z.ai GLM-5.2 PONG smoke.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Hunter B
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