feat: GRAPH.EFFECT command + effects replication

[AviAvni]

Summary

• Add GRAPH.EFFECT command: replays binary effects buffer on replica (create nodes/edges, update attrs, schema changes, index operations)
• Add replicate_effects(), should_use_effects(), build_index_effects() to graph_core.rs
• Update WriteQueryResult to carry effects buffer for replication
• Register effect module in commands/mod.rs

Command not yet registered in lib.rs — that happens in the final wiring PR.

Part of splitting #359 into smaller reviewable PRs.

Test plan

• cargo check passes
• Full integration tested in follow-up PR when wired into lib.rs

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 967f3bd9-2f54-4569-a4cd-731e8a5917c2

📥 Commits

Reviewing files that changed from the base of the PR and between fb5ec4a and 47cfa22.

📒 Files selected for processing (3)

• src/commands/effect.rs
• src/commands/mod.rs
• src/graph_core.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch effects-replication

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[codecov]

Codecov Report

❌ Patch coverage is 30.19943% with 245 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.96%. Comparing base (7c72209) to head (47cfa22).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
src/commands/effect.rs	0.00%	231 Missing ⚠️
src/graph_core.rs	88.33%	14 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #383      +/-   ##
==========================================
- Coverage   82.32%   81.96%   -0.37%     
==========================================
  Files         110      111       +1     
  Lines       30078    30424     +346     
==========================================
+ Hits        24762    24937     +175     
- Misses       5316     5487     +171     

Flag	Coverage Δ
fuzz	40.81% <ø> (+0.27%)	⬆️

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