#31 chore: remove cost estimation and complexity scoring bindings

Summary

• Remove guard_complexity_score and guard_estimate_cost from guard.py (Rust bindings removed in internal PR)
• Remove complexity_score and estimate_cost endpoints from server.py
• Replace guard_complexity_score call in feedback_store.py with simple length-based heuristic max(1.0, len(sql) / 100.0)
• Remove associated tests from test_guard_new.py

4 files changed, 3 insertions, 113 deletions

Companion to: https://github.com/AltimateAI/altimate-core-internal/pull/38

Test plan

• Verify server starts without import errors
• Verify feedback store still works with length heuristic fallback
• CI passes

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