Always generate mock configuration wrappers

[dfed]

Summary

• always generate SafeDIMockConfiguration for every mock-tree edge, including simple leaves
• co-locate a rooted type's owned SafeDIMockConfiguration with its Type+SafeDIMock.swift output instead of leaving it in the shared configuration file
• update the mock customization docs and golden tests for the new always-wrapper API shape

Why

Simple leaf overrides previously used raw builder values while richer nodes used configuration objects. That meant a child could change categories at the call site as it evolved from a leaf into a configurable subtree. This change makes the generated mock API structurally uniform and keeps consumer call sites stable as dependencies grow.

What changed

• removed the needsConfigurationStruct split from mock generation so every edge now routes through .safeDIBuilder on a config object
• updated root SafeDIParameters generation to always store config objects for tree children
• partitioned mock configuration output so rooted types own their own SafeDIMockConfiguration in their dedicated mock file, while the shared SafeDIMockConfiguration.swift only keeps non-rooted or orphaned config types
• documented that every child dependency gets a configuration object, even when it is currently a simple leaf
• refreshed the mock-generation golden tests to match the new generated API

Validation

• swift build --traits sourceBuild
• swift test --traits sourceBuild
• ./CLI/lint.sh

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (855ee44) to head (0d5fa2f).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #235   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           41        41           
  Lines         5752      5715   -37     
=========================================
- Hits          5752      5715   -37     

Files with missing lines	Coverage Δ
...afeDICore/Generators/DependencyTreeGenerator.swift	100.00% <100.00%> (ø)
Sources/SafeDICore/Generators/ScopeGenerator.swift	100.00% <100.00%> (ø)

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