test(engine): add determinism, logging hygiene, and importability tests

[borjamoskv]

Adds tests/engine/test_engine_determinism.py covering:

• Parametric importability check for every cortex/engine module
• AST-based bare print() detection per engine file (logging hygiene)
• Root logger suppression guard (engine must not set level to CRITICAL)
• Sanity guard: engine directory must contain at least one module

Closes #397

▀▄ CORTEX-PERSIST PULL REQUEST

█ EPISTEMIC HUMILITY CHECKLIST

All generative AI code is treated as conjecture until deterministic validation is proven. You MUST check all boxes before this PR can be merged.

• Determinism: I have not introduced any stochastic behaviour in the core runtime without deterministic guards.
• Hash Continuity: I have verified that changes to persistence do not break existing SHA-256 Merkle chain validation.
• C5-REAL Validation: I have executed the test suite locally and the output is deterministically successful.
• Industrial Noir 2026: If UI/CLI changes are present, they adhere to the #0A0A0A (Black), #2B3BE5 (Blue), and Humanist Sans brutalist aesthetic.

█ ARCHITECTURAL IMPACT

(Provide a concise explanation of the causal effect of this PR. Zero decorative prose. Every sentence must change behavior.)

Context:
Changes:
Telemetry / Performance Delta (if any):

█ VERIFICATION EVIDENCE

(Paste relevant CLI output, test success logs, or C5-REAL cryptographic proofs demonstrating the change functions as claimed)

# Paste verification logs here

[github-actions]

∞ MÖBIUS — PR Analysis

Metric	Value
Files changed	1
Total changes	129 (+/-)
Complexity	medium
Est. review time	15 min
Has tests?	✅
Has Rust changes?	No

Labels applied: tests

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