Function resolve_environment_dual_path 

fn resolve_environment_dual_path(
    profile: &Profile,
    config: &LandConfig,
    merge_env: bool,
    cli_overrides: &[(String, String)],
) -> HashMap<String, String>

Resolve environment variables with dual-path merging.

This function implements the dual-path environment resolution:

• Path A: Shell environment variables (from process)
• Path B: CLI profile configuration (from land-config.json)

Merge priority (lowest to highest):

1. Template defaults
2. Shell environment variables (if merge_env is true)
3. Profile environment variables
4. CLI –env overrides

Arguments

• profile - The profile configuration
• config - The land configuration
• merge_env - Whether to merge with shell environment
• cli_overrides - CLI –env override pairs

Returns

Merged HashMap of environment variables