Validate hook arrays in each config file before deep-merging so malformed entries fail with source-path context instead of surfacing later as a merged hook parse error.
Constraint: Runtime hook config currently supports only string command arrays
Rejected: Add hook-specific schema logic inside deep_merge_objects | keeps generic merge helper decoupled from config semantics
Confidence: high
Scope-risk: narrow
Reversibility: clean
Directive: Keep hook validation source-aware before generic config merges so file-specific errors remain diagnosable
Tested: cargo build --workspace; cargo test --workspace
Not-tested: live claw --help against a malformed external user config
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