Fix #1275 accessing egs_glib geometries by ausgab objects

[mchamberland]

Summary

• Fixes #1275 by making egs_glib geometries discoverable by both names:
  • the outer wrapper name (existing behavior)
  • the internal included simulation geometry name (new alias behavior)
• Keeps lookup deterministic and backward compatible by preserving primary-name precedence and adding alias collision warnings.
• Adds a focused regression suite (positive + negative + label-based cases) under HEN_HOUSE/egs++/geometry/examples, plus a helper script:
  • run_glib_alias_tests.sh

What changed

• Geometry registry
  • Added alias storage and lookup support in EGS_BaseGeometry internals.
  • Added EGS_BaseGeometry::addGeometryAlias(...).
  • Clears/removes aliases with the geometry lifecycle.
• egs_glib
  • Captures the included geometry name before the wrapper rename.
  • Registers the original name as an alias after the rename.
  • Warns if alias registration fails (e.g. collision).
• Tests
  • Added egs_glib include examples and egs_app inputs for:
    • internal-name success
    • wrapper-name success
    • both names in one input (glib_alias_pos_both)
    • missing geometry (expected failure)
    • alias collision (expected failure)
    • region-label usage (glib_alias_labels_pos)
    • unknown dose-region label with glib + alias lookup (glib_alias_labels_neg_unknown_label; still completes successfully given current fallback behavior)

Validation

• Ran the full matrix via HEN_HOUSE/egs++/geometry/examples/run_glib_alias_tests.sh:
  • PASS expected: internal / wrapper / both / label tests / unknown-label probe
  • FAIL expected: missing geometry and alias collision tests
• Confirmed non-zero scoring in generated 3ddose outputs for the positive cases checked.
• Performance sanity check: no measurable runtime difference between wrapper-name and alias-name lookup paths in repeated egs_app runs.