IDEs can pass their own Claude hooks through
`_meta.claudeCode.options.settings.hooks` on `session/new` and
`session/load`. Before this change, any session settings replaced
`CLAUDE_MODEL_CONFIG` entirely, so adding a single hook dropped the
deployment's `modelOverrides` / `availableModels`. The two are now
merged, and the session settings win per key.
The wrapper does not merge hooks itself: Claude Code already runs the
hooks of every settings tier, so user and project hooks keep running
next to the session ones. Hooks stay scoped to their session, and a
`session/load` with different settings recreates the query, which
replaces or removes them.
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Allow providing Claude model settings via env var on startup. Providing
model settings is required when using Claude with alternative llm
provider, e.g. Bedrock as models have different IDs there
