fix: correctness bundle for #39, #30, #29

[akshatsha5ill]

• gl_utils: exclude test from MetaAgent workspace to prevent test-data leakage (Fixes [Test Data Leakage] MetaAgent can Access Test Dataset during Training #39). Only affects ./domains via ignore_function_domains; tests/ outside domains unaffected.
• meta_agent: wire eval_path and iterations_left into instruction so MetaAgent learns from prior evals and budgets exploration (Fixes MetaAgent.forward accepts eval_path and iterations_left parameters that are never used in the body #30). Conditional injection keeps behavior when falsy/None.
• select_next_parent: replace uniform random.choice with novelty-weighted sampling P(c) proportional to 1/(1+child_counts) (Fixes select_next_parent computes child_counts but never uses it; selection is uniform random #29). Reduces mode collapse; uses np.random.choice.
• tests: add test_leakage, test_meta_agent (6 tests), test_select_next_parent (3 tests, 2000-trial distribution) plus conftest mocks for heavy deps.

Closes #39, #30, #29. Supersedes #32, #31 (shadow #7).

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