HermesIntegration.build_exec_args routed argv[0] through
_resolve_executable() but never called _apply_extra_args_env_var(), so
the documented per-integration extra-args env hook was silently dropped
for hermes — the same class of bug fixed for cursor-agent in #3265.
Insert the hook after the base 'chat -Q' command and before Spec Kit's
canonical -m/--json/-s/-q flags (mirrors opencode), so operator args
can't displace or clobber the canonical flags.
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
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