feat: graph accessors, schema_version, sync indexes, resize refactor

[AviAvni]

Summary

Split from #359. Adds public API surface needed by persistence and effects replication.

• schema_version on Graph — tracks schema changes (new labels, types, attributes)
• MvccGraph::from_graph() — construct from existing Graph for RDB load
• Sync index creation/population — create_index_sync, populate_indexes_sync
• New accessors: get_type_id_mut, max_relationship_id, deleted_*_count, label_matrices, relationship_tensors, attribute name helpers
• Resize refactor: extract resize_node_matrices/resize_relationship_matrices helpers

Test plan

• cargo check passes
• cargo test -p graph passes
• No behavioral changes — new methods and fields only

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: dd1fce7b-57f4-49c3-9ae7-c6170b684afc

📥 Commits

Reviewing files that changed from the base of the PR and between 553c6ba and 2abe6b9.

📒 Files selected for processing (3)

• graph/src/graph/graph.rs
• graph/src/graph/mvcc_graph.rs
• graph/src/index/indexer.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch graph-accessors-schema-version

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[codecov]

Codecov Report

❌ Patch coverage is 21.27660% with 148 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.14%. Comparing base (d51f96e) to head (2abe6b9).
⚠️ Report is 13 commits behind head on main.

Files with missing lines	Patch %	Lines
graph/src/graph/graph.rs	15.38%	132 Missing ⚠️
graph/src/index/indexer.rs	0.00%	10 Missing ⚠️
graph/src/graph/mvcc_graph.rs	72.72%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #378      +/-   ##
==========================================
- Coverage   84.15%   83.14%   -1.02%     
==========================================
  Files         110      110              
  Lines       28963    29367     +404     
==========================================
+ Hits        24375    24418      +43     
- Misses       4588     4949     +361     

Flag	Coverage Δ
fuzz	41.36% <3.19%> (-0.53%)	⬇️

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