refactor: update registry initialization in CompiledGraph to use Maps for improved immutability

[cantemizyurek]

Summary by CodeRabbit

• Bug Fixes

  • Compiled graphs now remain unchanged when the original graph is modified after compilation, ensuring consistent and reliable execution.

• Tests

  • Added tests to verify compiled graph integrity following modifications to the source graph.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 65c1c06

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[coderabbitai]

📝 Walkthrough

Walkthrough

The PR modifies CompiledGraph's constructor to clone registries (nodeRegistry, edgeRegistry, subgraphRegistry) into new Map instances instead of assigning them directly, preventing shared mutable references. Corresponding immutability tests are added to verify that mutations to the original graph after compilation do not affect the compiled graph.

Changes

Cohort / File(s)	Summary
Registry Cloning src/compiled-graph.ts	Constructor now clones node, edge, and subgraph registries into independent Map instances. Edge registry cloning includes shallow copying of edge arrays to ensure immutable-like behavior.
Immutability Tests tests/graph.test.ts	New test suite "Graph - Immutability after compile()" verifies that mutating the original graph after compile() does not affect the already compiled graph's execution order.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• refactor: restructure Graph class to utilize CompiledGraph #13: Introduced CompiledGraph and its registry infrastructure, which this PR now updates to ensure defensive copying of registries.

Poem

🐰 Cloning registries with care,
Maps and arrays everywhere,
No more shared mutations here,
Compiled graphs now crystal clear! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: updating registry initialization in CompiledGraph to use Map cloning for improved immutability, which aligns with both the code changes and test additions.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch cantemizyurek/fix-graph-mutable

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