Fixes#3162
`resolve_model_ids` is a documented top-level config key (CONFIGURATION.md)
read by core.cjs and session-runner.ts, but was missing from the CJS and SDK
VALID_CONFIG_KEYS allowlists — causing config-set to reject it with
"Unknown config key".
`workflow._auto_chain_active` is internal runtime state intentionally excluded
from VALID_CONFIG_KEYS by #2530, but plan-phase, execute-phase, discuss-phase,
transition, and new-project workflows all write it via `config-set`. Without
a valid write path these calls emit spurious errors (silenced with `|| true`
but noisy in logs). A new RUNTIME_STATE_KEYS set in config-schema.cjs holds
keys that isValidConfigKey() accepts without exposing them as user-settable
options — preserving the #2530 intent while fixing the runtime error.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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